WARNING DANGEROUS SOLUTIONS WARNING DANGEROUS …

WARNING

DANGEROUS SOLUTIONS

such as PC 111 and dry cleaning solventare used with this materiel, and if vapors

are inhaled, for extended periods, could be veryharmful. These materials should be used sparingly, and

in a well ventilated location.

WARNING

DANGEROUS PROCEDURES

such as the selector lever not positionedin “safe” position, when loading, or if not

ready to fire, and the rifle is loaded, could resultin death or injury to personnel if the rifle would

accidentally fire. Also if bolt cam pin is missing thiswill result in a blown-up rifle.

WARNING

DANGEROUS CONDITIONS

water in the barrel could result in a blown-up rifle.

If a noticeable difference in sound orrecoil is experienced, further firing should

be suspended. This could indicate that the bullethas not been propelled with sufficient force to clear

the bore. If firing is continued, it could result in ablown-up rifle.

WARNING

AMMUNITION DESTRUCTION

by any type of mechanical means could result in injuryor death.

TECHNICAL MANUAL

No. 9-1005-249-12

CHAPTER 1.Section I.

II.CHAPTER 2.

Section I.II.

III.IV.

CHAPTER 3.

Section I.II.

III.IV.V.

VI.CHAPTER 4.

5.6.

APPENDIX A.B.

C.

*TM 9-l 005-249-l 2TM 05538A-12

T.O. 11 W3-5-5-11

HEADQUARTERSDEPARTMENT OF THE ARMYWASHINGTON, D.C., 2 August 1968

OPERATOR AND ORGANIZATIONAL

MAINTENANCE MANUAL

INCLUDING BASIC ISSUE ITEMS

LIST AND REPAIR PARTS

AND SPECIAL TOOLS LIST

RIFLE, 5.56MM, Ml6

RIFLE, 5.56MM, M 16A 1

BIPOD, RIFLE, M3

This manual is current as of I5 May 1968.

INTRODUCTIONParasraDhs Pages

General .._._.~ .._.~~~~..._~ ___~.__~__. ___.____~~_____.._..___ l-1,1-2Description and data __ ._. _ . . . . . . _~ _..__.~..__..~~.._.. l-3,1-6OPERATING INSTRUCTIONSService upon receipt of materiel 2-1,2-2Controls .~_......~..~_.____...__.-~---_--.--_...--__-.-._-..~~-- 2-3

2294

66

Operation under usual conditions . _ _. 2-4,2-12 7,lOOperation under unusual conditionsOPERATOR AND ORGANIZATIONAL MAINTENANCE

_ 2-13,2-1’7 10,ll

INSTRUCTIONSTools and equipment and repair parts 3-1,3-2Cleaning and lubrication instructions 3-3,3-6Preventive maintenance services _ 3-6,3-7Troubleshooting _ 3 - 8Operator maintenance _ _ . _.~_~.~ ._.. _.__~_ 3-9,3-12Organizational maintenance proceduresMATERIEL USED IN CONJUNCTION WITH MAJOR ITEMS ::

3-134-1,4-6

AMMUNITION . ..~..._.._~_.__._...~.~.__._._._._~_____.____-- 61,6-7DEMOLITION OF MATERIEL TO PREVENT ENEMY USE _ 6-1,6-2REFERENCES . . .._._____.__.._..._--- ._____...____________._. . .._._..ORGANIZATIONAL MAINTENANCE REPAIR PARTS AND

SPECIAL TOOLS LIST _~...~._...~__.._____..._---..--_.__.._ ..___...BasicIssueItemsList .._.__..__ _... _~__~.____.~.~~_ . . . . ___ ._... _ . ..__..Repair Parts For:

13131819222832

34,363638

3947

Major groups and assemblies (fig. B-2)Upper receiver group (fig. B-3)Bolt carrier group (fig. B-4)Lower receiver group (fig. B-6)Rod, Cleaning, Small Arms, MllE3 (fig. B-l)

Tools and Equipment (figs. B-l, B-6, B-7 and B-8)MAINTENANCE ALLOCATION CHART ________.___________._.. _____... 54

*This manual supersedes that portion that pertains to operator and organizational maintenance TM 9-1005-249-14,1 Aug 1966 and changes.

1

CHAPTER 1

INTRODUCTION

Section I.

l - l . Scope

This manual contains instructions for theoperation and organizational maintenance ofRifle, 5.56-MM, M16, Rifle, 5.56-MM, M16A1,and Bipod Rifle M3, allocated to the operator/crew by the MAC. (Refer to appendix C) .

l-2. Forms and Records

a. General. DA forms and procedures usedfor equipment maintenance will be only those

GENERAL

prescribed in TM 38-750, Army EquipmentRecord Procedures.

b. Recommend&ions for Maintenance Man-ual Improvements. Report of errors, omissionsand recommendations for improving this man-ual by the individual user is encouraged. Re-ports should be submitted on a DA Form 2028(Recommended Changes to DA Publications)and forwarded direct to Commanding General,Headquarters, U.S. Army Weapons Command,ATTN: AMSWE-SMM-P, Rock Island, Illi-nois 61201.

Section II. DESCRIPTION AND DATA

l-3. Description

a. Rifles Ml 6 and Ml 6Al. The rifles (fig.l-l and fig. 1-2) are lightweight, air-cooled,gas operated, magazine fed, shoulder or hipfired weapons, designed for either automaticor semiautomatic fire through the use of selec-tor lever. The rifles accommodate the Bayonet-Knife, M7. A brief description of the compo-nents is as follows:

(1) The barrel is air-cooled. The barrelassembly includes an adjustable front sight,flash suppressor, and two handguards, madeof heat resisting material, with a heat reflect-ing inner shield.

(2) The butt stock is made of durablesynthetic material of high impact strength.

(3) The rifles are easily opened. Thisshows the working parts, and makes it easyfor cleaning and inspection.

(4) The bolt locking action is one of themechanical features of the rifles. The bolt andbarrel extension contain locking lugs, which

2

engage and lock the bolt firmly in the barrelextension. The initial force of the explosionof the cartridge is absorbed by the barrel, bar-rel extension, and bolt.

(5) A lightweight aluminum alloy re-ceiver provides durability while reducing theoverall weight of the rifle.

b. Biped, Rifle, MS. The bipod, rifle (fig.l-3) is a lightweight, non-adjusting mountwhich clamps on the barrel of the rifle (fig.3-9).

l-4. Tabulated Data

a, Rifles Ml 6 and Ml 6Al.Weight:

Rifle, M16, without magazine andsling __ ____________________--__ 6.3 lb

Rifle, M16A1, without magazine andsling ..__..____________ .__----- -- 6.5 lb

Sling, Ml ________________._________ 0.4 lbEmpty magazine ___ 0.2 lbLoaded magazine ________________ 0.7 lb

WE 60037

Figure l-l. Rifle, 5.56-MM, Ml6--right rear view.

WE 19697

Figure l-2. Rifle, .5.56-MM, MlGAl-right rear view.

Rifle, M16, w/sling and loadedmagazine ____________________--__ 7.4 lbRifle, M16A1, w/sling and loaded

magazine ____ ____ 7.6 lbBayonet-Knife, M7 _______________ 0.6 lbScabbard, M8Al __________________ 0.3 lb

Length :Rifle w/flash suppressor ___________ 39 inRifle w/bayonet-knife __________ 44.25 inBarre l ____________________--____ 20 inBarrel with flash suppressor _______ 21 in

Mechanical features :Rifling, R.H. 6 grooves-l turn in 12 inches:

Method of operation __________________ gasType of breech mechanism ____ rotating boltMethod of feeding ______________ magazineCooling ____________________-------- airAmmunition :

Caliber ______________________ 5.56MMType _____ Ball, blank, dummy and tracer

Firing characteristics :Muzzle velocity (approximate) __ 3,260 fps

3

WE 60214

Figure 13. Biped, Rifle, MZ and Case.

Muzzle energy _______________ 1,300 ft-lbChamber-pressure ___________ 62,000 psiCyclic rate of fire ________ ‘700/800 rds/m

Maximum rate of fire:Semiautomatic ____________ 45/65 rds/mAutomatic ______________ 150/200 rds/mc

Sustained rate of fire __________ 12/15 rds/mMaximum range _____________ 2,663 metersMaximum effective range ______ 460 meters

b. Biped, Rifle, Ma.

Weight :Bipod ____________________-____ 0.6 lbBipod ease _____________________ 0.2 lb

l-5. Difference in ModelsRifle M16Al (fig. l-2) differs from Rifle

Ml6 (fig. l-l) as it contains a forward assistassembly. The forward assist assembly (fig.2-l) when pressed forward forces the bolt intothe locked position.

4

CHAPTER 2

OPERATING INSTRUCTIONS

Section I. SERVICE UPON RECEIPT OF MATERIEL

2- l . Genera l SkP

a. When new or reconditioned rifles or bi- 2pods are received, it is the responsibility of the 3officer in charge to determine whether themateriel has been properly prepared for serv-ice by the supplying organization and to besure it is in condition to perform its function.

4

b. A record will be made of all missing parts,tools and equipment, and any malfunctionswill be reported through appropriate channels.Corrective action will be initiated as quicklyas possible. 5

6

2-2. Services

Refer to table 2-l.

Table 2-l. Service Upon Receipt of Materiel

2-3. General vided for the proper operation of the materiel.

Reference

App B, Sect II71

Action

Clear rifle __.___ __...._..___Remove bolt carrier group

from rifle and visually in-spect for proper assembly,damaged or missing parts.

Clean and lubricate (rifle andbipod) .

Note. Wipe excess oil frombore and chamber. Particu-lar attention should begiven to cleaning the boltcarrier key.

Reassemble the weapon _..._.Hand function to assure prop-

er operation.

Note. When retracting thebolt, give special attentiont o ass*e fb-ee mo+vemEntbetween bolt carrier and gastube.

Check magazine for positiveretention and functioning ofbolt catch.

Reference

Fig. 2-2Fig. 3-11

I’able 3- l

Fig. 3-11Par. 3-2

Par. 2-6b

Section II. CONTROLS

a. This section describes, locates, illustrates,and furnishes the operator essential informa-tion pertaining to the various controls pro-

b. Refer to figure 2-1 for controls and theirfunctions.

I CATCH PIN TO BE FLUSH OR PROTRUDING.OPERATOR AUTHORIZED TO ADJUST BUT NOTT o R E M O V E A N D INSTALL ( S EE T A B L E 3 - 3 ) .

SELECTOR LEVER - Selects “SAFE” position or typeof f i r ing.

MAGAZINE CATCH BUTTON - Releases magazinewhen pressed.

BOLT CATCH - Holds bolt and bolt carrier in openposition. To engage bolt press lower tang of boltcatch. To release bolt press upper tang of bolt catch.CHARGING HANDLE - Retracts bolt and bolt carrier.

f -

!

\L

EJECTION PORT COVER - Remains closed tokeep dust out and opens automatically when boltcarrier moves rearward or forward.

and rotate post. Each graduation (notch) moves thepoint of impact of the bullet 0.7 cm (17/64 in.)at 25 meters (27 yards), 2.8 cm100 meters (109 yds), 5.6 cmmeters (218 yds), etc. UP marked on sight isdirection to turn post to raise line of fire.

REAR SIGHT - Has two apertures for range.marked aperture - short O-300 meters (328 yds)

range. L.under aperture -(546 yds) range.

long 300-500 metersTo adjust windage - depress (I

detent and rotate drum to desired direction. Tomove point of impact to right, turn drum clock- Ewise in direction of arrow and letter R. Tomove left, move drum counterclockwise. Amountof correction same as front siaht.

FORWARD ASSIST ASSEMBLY 5,,

:.8:,I ,’

‘ FORWARD ASS IS T ASSEMBfails to close and lock, press forward assist‘

W I N T E R F I R I N G - Depress pin and open trigger guard. assembly until bolt is moved into closed position.

W E 16087A

Figure 2-1. Controls.

6

Section III. OPERATION UNDER USUAL CONDITIONS

24. GeneralThis section contains, instructions for the

operation of rifles under moderate tempera-tures and humidity. Instructions for operationunder unusual conditions are covered in Sec-tion IV.

2-5. Preparation for Firinga. Refer to table 2-2 for cleaning and lubri-

cation materials and stock numbers for requi-sitioning purposes.

8020-244-0153

7920-205-24016850-965-23329920-292-9946

6850-224-66566850-224-665’76850-224-66635350-221-0872

8030-535-97808030-850-70766850-281-19858010-527-2884

9150-935-65979150-889-35229150-687-42419150-753-46869150-292-9689

9150-261-78999150-262-8990

8010-526-25238010-584-24267920-205-17111005-912-4248

Table 2-2. Materials Required for Maintenunce

Note. The letter in the maintenance level column indicates the lowest level ofmaintenance at which these materials can be used. Letter C indicates operatorand letter 0 organizational.

BRUSH, ARTISTS: metal ferrule, flat, chisel edges, 7/6 w, l-1/8 lg, exposedbristle.BRUSH, CLEANING, TOOLS AND PARTS: ______._..___.___.___..__ __..-CARBON REMOVING COMPOUND: (P-C-111) (5 gal pail) _.___.__.__.___.CLEANER, TOBACCO PIPE: cotton tuft, wire core (Dills) (36 per pkg) . _ - . .CLEANING COMPOUND, RIFLE BORE: small arms bore cleaner, solution

(CR).2 oz plastic bottle6 oz can1 gal can

CLOTH, ABRASIVE : crocus, ferric oxide and quartz, jean-cloth-backing,closed coating, 9 w, 11 lg, 50-sh-sleeve (CA).

COATING COMPOUND, BITUMINOUS, SOLVENT TYPE : polyvinyl butyrolresin and phosphoric acid (touch up).MIL-C-15328.1 oz kit1 qt kit

DRY CLEANING SOLVENT: (SD) (lgal can) __... ~~ ~_...___.._.._~__.~LACQUER: black (jet) lusterless, acrylic nitrocellulose type, (touch up) MU.-

L-19538 (1 gal can).LUBRICATING OIL, SEMI-FLUID : MIGG46000A (LSA) ~.

2 oz plastic bottle4 oz plastic bottle1 qt can1 gal can

LUBRICATING OIL, WEAPONS: (LAW) (1 qt can) _.._..__._..___ . . .._..PENETRATING OIL: Spec, Fed, VV-P-216 _________.___.______--_-_-__-_--

1 pt can1 qt can

PRIMER COATING: yellow, cellulose-nitrate, corrosion-inhibiting (touch up)MIL-P-7962.5 gal can12 oz aerosol can

RAG, WIPING: cotton (50 lb bag) _ . .._._.____. ______ ._.... ___~_.___.._..SWAB, SMALL ARMS CLEANING: _. .._______.__.__..______-_--_________

C

C0CC

0

0

00

C

C0

0

CC

b. Clear rifle as shown in figure 2-2. c. Clean and lubricate as indicated in table

Note. Before performing step 1 of figure 2-2, at- 3- l .tempt to point the selector lever toward SAFE (fig.2-2). If the rifle is not cocked the selector lever cannotbe pointed toward SAFE. If this is the case, do not

2-6. loadingcock the rifle at this time. a. Loading the Magazine. The magazine has

7

The rifle is now loaded and can be fired whenthe selector lever is placed in the automaticor semi-automatic position.

Warning: If not ready tp fire, be sure theselector lever is placed in the “safe” position.

2-7. Precautions in Firing Ammunition

a. The general precautions concerning thefiring and handling of ammunition in thefield, as described is TM 9-1300-206, will beobserved. In addition, the precautions givenin the following paragraphs should be closelyobserved in order to prevent injury to person-nel or damage to materiel.

b. Ammunition which is seriously corrodedshould not be fired.

c. Cartridge cases are easily dented andshould be protected from hard knocks andblows. Dented cartridge cases may jam in thechamber, and cause difficulty in extraction.

d. Cartridges which have been seriouslydamaged, or those having loose bullets, shouldnot be used.

e. The cartridges should be kept clean andfree of foreign matter.

f. Cartridges which have been elevated totemperatures of 135” F., (uncomfortable tohold) or more, due to exposure to direct radi-ation from the sun, or other sources of heat,should not be fired while at these temperaturesor dangerously high chamber pressures mayresult. When returned to lower temperatures,these cartridges are safe to fire.

g. If a cartridge remains in the chamber ofa very hot weapon at any time firing is inter-rupted, the cartridge should be removed im-mediately or there should be a 15-minute waitto prevent the possibility of injury to person-nel in the event of a cartridge cook-off.

Warning: If a noticeable difference in soundor recoil is experienced, further Aring shouldbe euspended. Either of these conditions couldindicate an incomplete propellant combustionand present the possibility that the bullet hasnot been propelled with suflicient force, to clearthe bore. In such instances, the bolt shouldbe retracted slowly to remove and identify thefired cartridge case. The weapon should be

cleared and examined for the presence of un-burned propellant grains in the receiver, orpossible presence of a bullet remaining in thebore. Any unburned propellant or obstructionin the bore should be removed, before furtherfiring.

Note. If bullet is lodged in bore, turn in rifle todirect support maintenance.

2-8. F i r ing

a. Selector Lever. The rifle may be firedsemi-automatically or automatically by mov-ing the selector lever (fig. 2-l) to the desiredposition as indicated in paragraphs b, and c,below.

b. Semi-Automulic Position. With the selec-tor lever in this position, the rifle will fire oneround each time the trigger is pulled.

c. Automatic Position. With the selectorlever in this position, the rifle will continue tofire until the magazine is empty or the triggeris released. When the rifle is fired in eitherSEMI or AUTO, the bolt will lock in openposition when the last round from a magazinehas been fired.

2-9. Stoppage and Immediate Action

a. Stoppage. A stoppage is any unintentionalinterruption in the cycle of functioning. Im-mediate or remedial action must be taken toclear stoppage.

b. Immediate Action. Immediate action isthe action taken to correct the stoppage with-out analyzing the cause. Immediate action toclear a stoppage in the rifle is as follows:

(1) Strike the forward assist assembly toinsure that the extractor has engaged theround (M16Al Rifle only). Tap upward on thebottom of the magazine to insure that it isfully seated. Pull charging handle fully to therear. Watch for ejection of a complete cart-ridge or cartridge case.

(2) If a cartridge or case is ejected, re-lease charging handle to feed a new round (donot ride charging handle forward). Strike theforward assist assembly to assure bolt closure(M16Al Rifle only). Attempt to fire theweapon. If weapon fails to fire, inspect to de-

9

termine cause of malfunction and take appro-priate action. (See troubleshooting, table 3-3.)

(3) If a cartridge or case is not ejected,check for a round in the chamber.’ If chamberis clear release charging handle to feed around, strike the forward assist assembly, andattempt to fire. If weapon still fails to fire,inspect to determine cause of malfunction andtake appropriate action. (See troubleshooting,table 3-3.)

(4) If a cartridge or case is noted inchamber it must be removed before attempt-ing to reload or recycle the rifle. A stuck cart-ridge or case can be removed by inserting thecleaning rod into the bore from the muzzle endand tapping the cartridge.

2-10. Misfires and Cook-Offsa. General. Although these malfunctions, de-

scribed in the following paragraphs, are rarelyencountered when authorized and properlymaintained ammunition is fired in properlymaintained and operated weapons, it is im-portant that all personnel concerned under-stand the nature of each kind of malfunction,as well as the proper preventive and correc-tive procedures, in order to avoid injury topersonnel or damage to materiel. General pre-cautions for removing chambered cartridgesassociated with these malfunctions are de-scribed in paragraph b, below.

(1) Misfire. A misfire is a complete fail-ure to fire which may be due to a faulty firingmechanism or a faulty element in the propel-ling charge explosive train.

(2) Cook-ofl. A cook-off is a functioningof any or all of the explosive components of acartridge chambered in a very hot weapon dueto heat from the weapon. To prevent injuryfrom a cook-off, observe the time limit pre-scribed in b, below.

b. Precautions. After a failure to fire, thefollowing general precautions, as applicable,will be observed:

Warning: A cook-off will occur after tenseconds of contact with the chamber in a hotbarrel.

(1) Attempt to remove the cartridge be-fore ten seconds has elapsed.

(2) In case of a cartridge chambered ina very hot rifle which can neither be fired norremoved, all personnel except the operator willremain clear of the rifle for a minimum of 15minutes.

(3) The operator will keep the rifletrained in a safe direction.

2-l 1. Operation after FordingWarning: Do NOT attempt to FIRE weapon

if water is present in barrel. Fording, heavyrain, or fog can cause water to be present inthe barrel.

Observe the following procedures to emptywater from the barrel:

Note. Make certain the muzzle cap is removed beforeperforming the following procedures.

a. Point the muzzle down.

b. Pull charging handle slightly rearwardto allow water to drain from muzzle.

c. Press forward assist to make sure theround is seated in the chamber and the bolt islocked. The weapon can now be fired.

Note. Clean and lubricate in accordance with table3-1, as soon as possible.

2-l 2. UnloadingRepeat operation in figure 2-2.

Section IV. OPERATION UNDER UNUSUAL CONDITIONS

2-13. General Conditions materiel is subjected to usual conditions.

a. See paragraph 2-14 through 2-17 for in- b. Report any chronic failure of materielstructions on lubrication under unusual con- resulting from subjection to extreme condi-ditions and table 3-2 for preventive mainte- tion on a DA Form 2407 in accordance withnance checks and services to be made when the TM 38-750.

10

2-14. Operation in Extreme Cold

a. In climates where the temperature is con-sistently below 0” F., it is necessary to pre-pare the materiel for cold-weather operation.The rifles should be cleaned and lubricated asindicated in table. 3-l.

b. Exercise the various controls throughtheir entire range at intervals as required.This aids in keeping them from freezing inplace and reduces the effort required to oper-ate them.

c. Materiel not in use and stored outsidemust be protected with a proper cover.

d. See FM 31-70 for further information onoperations in the Arctic.

2-15. Operation in Extreme Heat

a. Hot Climates.

(1) When operating in hot climates, thecoating of oil necessary for operation and pres-ervation will dissipate quickly. Inspect therifles and bipod frequently, paying particularattention to all hidden surfaces of bolt car-rier group, forward assist assembly (M16AlRifle) and lower receiver components.

(2) Perspiration, contributes to corro-sion because it contains acids and saits. Afterhandling rifle, clean, wipe dry and oil usingsemi-fluid lubricating oil (LSA).

b. Hot, Drv Climates. Clean and oil the boreof the rifles more frequently, when operatingin hot, dry climates.

2-16. Operation in Dusty and Sandy Areas

a. Clean and lubricate the rifle more fre-quently. Exercise particular care to keepsand out of mechanisms when inspecting andlubricating weapon. Shield parts, from flyingsand or dust, with paulins during disassemblyand assembly operations. Clean and lubricatethe rifle after action is over.

b. The rifle cover, magazine bag and theprotective cap for the muzzle of the rifle aredesigned to protect the rifle against excessivedust, sand and water. These items are reus-able provided they are not damaged. Theyshould not be used on rifles or magazines

which are to be stored in excessas condensation may develop.

of 24 hours,

Note. Use of the rifle cover, magazine bag and pro-tective cap does not change the maintenance require-ments for the rifle.

(1) Rifle cover features.(a) A rubber band is used to seal

the cover. Removing the rubber band is thenormal method of opening the cover.

(b) A tear line along the length of thecover provides for quick entry. (Use of thetear line destroys the cover.)

(c) In emergency conditions the selec-tor lever and trigger can be operated throughthe cover. However, the ejected cartridge caseswill be trapped and destroy the cover and maycause the rifle to malfunction.

(2) Magazine bag features.(a) A tear line across the bag provides

quick access to the magazine.(b) Packaged magazines should not be

left in direct sunlight as high temperaturescan cause the bags to become tacky and sticktogether.

(c) Do not attempt to insert a pack-aged magazine into the magazine well of therifle. This will cause the rifle to become inoper-ative and removal of the magazine can bedifficult.

(3) Yrotectiue cap features.(a) The cap should be removed before

firing the rifle. However, the cap is designedso that a bullet will pass through the endwithout affecting accuracy and without caus-ing a safety hazard to the user.

(b) Do not place a cap on a hot rifle.The plastic will become soft and form into thegrooves of the flash suppressor making itdifficult to remove.

2-17. Operations Under Rainy, HumidConditions and Salt Water Areas

a. Inspect the materiel more frequentlywhen operating in hot, moist areas.

b. When materiel is in use, clean and lubri-cate the bore and chamber and exposed metalsurfaces more frequently than prescribed fornormal service.

11

c. Moist and salty atmospheres have a ten-dency to mix with oil and grease and destroytheir rust preventive qualities. Inspect allparts frequently for rust or corrogion.

d. Then materiel is not in use, cover allmetal surfaces with a film of semi-fluid lubri-eating oil (LSA).

12

CHAPTER 3

OPERATOR AND ORGANIZATIONAL MAINTENANCE INSTRUCTIONS

Section I. TOOLS AND EQUIPMENT AND REPAIR PARTS

3-l. Tools and Equipment 3-2. Repair PartsTools and equipment issued with or author- Repair parts for the operator and organiza-

ized for the operator and organizational main- tional maintenance are listed in appendix B.tenance are liked in appendix B.

Section II. CLEANING AND LUBRICATION INSTRUCTIONS

3-3. GeneralThis section contains pertinent cleaning and

lubricating instructions for operator and or-ganizational maintenance.

3-4. Cleaning and lubrication

Refer to table 3-l.

Note. The letters in the maintenance level columnindicate the lowest level of maintenance at which cor-rective action can be performed.

3-5. Definition for the Application of LSA

Definition for the amount of LSA specifiedin table 3-l are listed in a through c below.

a. One Drop. Dip the end of the swab holdersection into lubricant and allow one drop tofall from the tip.

b. Light Coat. Apply lubricant to a clothuntil it becomes just damp enough so the oilcan not be squeezed from the cloth. When ap-plied, the part will have a film of lubricant,which is barely visible.

c. Generous Coat. Apply lubricant to a clothuntil it becomes saturated enough so the oilcan be squeezed from the cloth. When applied,the part will have a film of lubricant heavyenough so that it can be spread with the finger.

.NOTE: INSERT BRUSH Iti KEY AS FAR AS’ -,POSSIBLE, THEN TURN BRUSH CLOCKWISE

iT0 REMOVE CARBON AND RESIDUE.WE 161731

Figure S-1. Cleaning carrier key.

BOLT CUTAWAY VIEWPIPE CLEANER

IC;;yER OF BOLT CARRIER

NOTE: INSERT PIPE CLEANER IN CARRIERKEY AS INDICATED, TLIRN CLOCKWISEAND REMOVE. MAKE CERTAIN ALL LINTIS REMOVED.

,, ’ WE 16175

Figure S-S. Drying carrier key.

13

Rifle

Magazineassembl

Boltcarriergroup

c

C

C

C

C

C

C

C

C

0C

Table. 3-l. Cleaning and Lubricating Instructions

Action required

Note. Lubricants listed below and specified within this table will be utilized. Do notuse any commercial products for cleaning and lubricating purposes.Semi-fluid lubricating oil (LSA) for temperature ranges of -36 degrees Fahrenheitand above.Weapons oil lubricating (LAW) for temperature ranges below zero degrees.Note. Either lubricant can be used at temperatures ranging from zero to -35 degreesFahrenheit.BEFORE OPERATION1. Prior to firing, visually inspect the bore and chamber for condition and obstruction.Clean by pushing swabs through the bore (from chamber to muzzle) until the swabsprotrude through the flash suppressor.

Caution: When inserting rod, into bore, hold at joints to prevent flexingor damage to rod.

2. After cleaning, apply a light coat of oil to the bore and chamber, with a swab, toprevent corrosion and pitting. Lightly lubricate the lugs in the barrel extension.3. The bolt carrier group may be removed as shown in figure 3-13. Remove dirt and oilfrom firing pin, outer and inner surfaces of the bolt and bolt carrier with clean dryswabs or rags. Also clean firing pin hole using a pipe cleaner. Lubricate the bolt andbolt (piston) rings. Make certain rings are well lubricated. Apply a coating of lubri-cating oil to the inner surfaces of the bolt carrier. Give special attention to the slideand cam pin area.

Warning: Most cleaning solutions are toxic and if the vapors from themare inhaled, for extended periods, could be very harmful. Thesematerials should be used sparingly and in a well ventilated location.

Note. The use of the rifle cover does not take the place of normal cleaning and lubri-cation.Disassemble and wipe dirt from the magazine tube, spring, and follower. Apply a light

coat of lubricant to the magazine spring.Note. Because moisture will collect in the plastic magazine bag, from condensation,the magazine must be removed, unloaded, and dried every 24 hours to prevent corrosion.After the cartridges and magazine have been dried, apply a light coat of lubricatingoil to the magazine spring.1. Disassemble the bolt carrier group and wash all components and outer surfaces witha swab saturated in rifle bore cleaner.

2. Clean bolt carrier key with a worn bore brush dipped in rifle bore cleaner (fig. 3-1).3. Dry bolt carrier key using pipe cleaners (fig. 3-2).4. Using a small brush dipped in rifle bore cleaner, scrub carbon deposits and dirt fromthe locking lugs of the bolt.

Caution: Brush the outer surface of the bolt, paying particular attentionto area behind the bolt rings and under lip of the extractor. Do NOTattempt to remove discoloration caused by heat.

5. Remove extractor from bolt, Using a small brush dipped in rifle bore cleaner scrubextractor to remove carbon. Also clean firing pin recess and firing pin. DO not removethe spring from extractor unless it is damaged.6. Clean ejector and spring by scrubbing with brush using rifle bore cleaner.7. When dry and before final assembly, apply a generous coat of lubricant to the out-side bolt body, rings, and a drop in bolt carrier key (fig. 3-3).

14

Item

Boltcarrier

group-cont’d

Upperreceiver

Barrel

Lowerreceiver

X

X

X

X

X

X

X

X

X

X

X

X

XX

X

-

%;.bJ

&

X

X

X

X

X

X

X

X

X

X

X

X

XX

X

-Y

:

Isij3-3

-

C

c

c

C

C

C

C

C

C

C

C

c

C

C

0

Table S-1. Cleaning and Lubricating Instructions-Continued.

Action required

Caution: The firing pin and firing pin recess in the bolt should only havea light coat of lubricant.

8. During cleaning and lubricating, inspect the bolt for cracks especially in the boltcam pin hole area.1. Clean the upper receiver of powder fouling with rifle bore cleaner.

Caution: Do NOT use wire brush on aluminum surface.

2. Clean the outside surface of the protruding gas tube in the receiver with a wornbore brush attached to a section of the cleaning rod (fig. 3-4). Clean top of the gastube by inserting rod and brush thru the back of the receiver. Clean sides and bottomof gas tube from the bottom of the receiver.3. After cleaning, coat the inner surfaces of the upper receiver with lubricant andapply a light coat to the outer surfaces.

Caution: Do NOT use any type of abrasive material to clean the gas tube.1. Attach the wire bore brush to rod, dip in rifle bore cleaner, and brush the bore fromchamber to muzzle (fig. 3-5). Push the brush through the bore until it extends beyondthe muzzle. Do NOT reverse direction of brush while in the bore. Continue until thebore is well covered with compound.2. Attach the chamber brush to the cleaning rod, dip in rifle bore cleaner, and insertin chamber (fig. 3-6). Use a minimum of five plunge strokes and three rotational(360”) motions.3. Remove brush from chamber and cleaning rod. Dry the bore and chamber withclean swabs. Do not reverse direction of swabs while in the bore. Continue until swabscome out clean and dry.4. After cleaning, lightly lubricate the bore and chamber with a swab to preventcorrosion and pitting. Lightly lubricate the lugs in the barrel extension.5. Lightly lubricate all the outer surfaces of the barrel and sight (including surfacesunder the handguard).

6. Apply lubricant generously to the front sight post screw, detent, and spring. De-press detent several times to work the lubricant into the spring.Note. Moisture from condensation, will collect in the bore of the rifle when the pro-tective cap is used on the muzzle. The cap must be removed and the bore cleaned andlubricated every 24 hours.1. Wipe dirt from trigger mechanism with a clean swab or brush.

Caution: Do NOT use wire brush on aluminum surface.

2. Components which are coated with carbon will be cleaned with rifle bore cleanerand an artist brush or similar brush. Use a scrubbing action to remove all carbon andforeign material. Drain rifle bore cleaner from lower receiver cavity and wipe dry.Use the opposite end of the brush with a piece of rag or cloth wrapped around itto get into the hard to get at places.3. Clean drain holes in butt cap screw using a pipe cleaner.4. After the lower receiver has been cleaned and dried, apply a light coat of lubricantto the buffer, action spring, inner surface of lower receiver extension. Also apply agenerous coating inside the lower receiver and all components including the take-downand pivot pins.5. Apply a generous amount of lubricant in the detent well,for the take-down pins, pivot pin, selector lever, and outerextension.

to the detents and springssurfaces of lower receiver

15

Item

Lowerreceiver

group-cont’d

Inactiveweapons

Bipodrifle

Bayonet-knife M’

ScabbardM&?Al andSling

-

1a-iI

x

X

X

X

X

X

X

X

-

C

C

C

C

00C

C

C

-

Table 8-l. Cleaning and Lubricating Instructions-Continued.

Action required

6. If the detents and springs are frozen the following procedures should be accom-plished.

a. Attempt to depress the detent by inserting a small punch into the slot of thepivot pin, thus forcing the detent into the recess. (Later production rifles have a holein the pivot pin for this purpose). Only limited movement is required to permitremoval of the pivot pin.

b. If the detent cannot be depressed enough to permit removal of the pivot pin,disassemble the rifle. Place the forward portion of the lower receiver in a containerof penetrating oil, bore cleaner, or PC-111, carbon removing compound, and allowto soak for a period of 24 hours. Then attempt to remove the compnents as describedin a, above.

Warning: Avoid skin contact. The compound should be washed offthoroughly with running water if it comes in contact with the skin.A good lanolin base cream, after exposure to compound, is helpful.The use of gloves and protective equipment is recommended.

c. After disassembly, the spring, detent, and detent well should be thoroughlycleaned, then generously lubricated with (LSA) before assembly to the rifle.

d. If the rifle cannot be disassembled by trying the methods described above, turnthe weapon in to direct support maintenance for repair.Inactive weapons will be preserved with a generous coat of (LSA) lubricating oil.Inspect these weapons on a weekly basis to determine condition of preservation. Wea-pons having corrosion or rust will be cleaned immediately and preserved in accor-dance with above instructions. All inactive weapons will be thoroughly cleaned andpreserved every 90 days.Note. Do not use the rifle cover or protective cap on rifles which are to be24 hours.1. Remove dirt or grease, using rifle bore cleaner.

2. Apply a generous amount of lubricant to all surfaces, making certainspring is well lubricated.

stored over

the tension

1. Clean dirt and grease from bayonet-knife. Apply a light coat of lubricant to theblade and generously lubricate the release. The release should work freely and returnto lock position.2. Minor nicks and dents will be removed with file or stone.

3. Remove grips to clean shank of blade assembly and apply a light coat of lubricant.1. To prevent mildew, shake out and air the scabbard and sling at frequent intervals.Mildewed canvas is cleaned by scrubbing with a dry brush.

2. Examine mildewed fabric carefully for evidence of rotting or weakening bystretching and pulling the fabric. If fabric shows indication of loss of tensile strength,turn in for replacement.3. Make certain all mildew is removed, before water is used to remove dirt. Oil andgrease may be removed by scrubbing with issue soap and water. Rinse well withwater and dry thoroughly.Caution: Do not use gasoline or any solvent to remove oil or grease from

canvas.

PLACE ONEDROP LSA

WE 13621A

Figure J-3. Oiling carrier key.

WE 13623

Figure 8-4. Cleaning gas tube in receiver.

17

Figure 8-5. Cleaning the bore.

Figure s-6. Cleaning the chamber.

Section III. PREVENTIVE MAINTENANCE SERVICES

3-6. General

a. Preventive maintenance is a systematiccare, inspection, and servicing of equipment tokeep it in serviceable condition, prevent break-downs and assure maximum operational readi-ness. The operator’s role in the performanceof preventive maintenance service is:

(1) To perform daily service each daythe rifle is operated.

(2) To help the organizational unit ar-morer perform any scheduled periodic serviceswhich are authorized to them.

3-7. Specific Procedures

a. Table 3-2 gives the specific procedures tobe performed by operator and organizationalunit armorer.

18

b. In addition to procedures outlined in table3-2, perform the following: Remove rust, dirt,grit, gummed oil, and water as these willcause rapid deterioration of the inner mecha-nism and outer surfaces. Take particular careto keep all surfaces clean and lubricated. Donot clean or polish outer surfaces of the weap-on with a treated cloth or other commercialcompounds.

c. Tighten loose parts and replace brokenor worn parts, as authorized.

d. Every six months check to see if all modi-fications have been applied. Refer to DA Pam310-7. No alteration or modification will bemade except as authorized by the modificationwork order.

Table 3-2. Preventive Maintenance Checks and Services

Itemno

1*2

*3*4

*5

6

*7

Tt Ovratm

B 5--

B-Before operationD-During operation

Item to be inspected

A-After operation M-MonthlyW-Weekly Q-Quarterly

Procedure

Wipe excessive oil from bore and chamberRetract bolt to assure free movement between

bolt carrier and gas tube.Hand function to assure proper operationCheck magazine for positive retention and func-

tioning of bolt catch.Clean and lubricate. Be sure to clean bolt

carrier key.Clean and lubricate detents and springs, for

takedown pin, pivot pin and selector leverand outer surface of lower receiver extension.

Clean and lubricate. Check bipod legs. Makecertain they move freely from closed to openposition under spring tension, and that ten-sion is of sufficient strength to hold thebipod to the rifle.

Reference

Table 3-l.Table 3-3.

Par. 3-12.Fig. 2-l.

Table 3-l

Table 3-l.

Table 3-l.

*Will be performed weekly. unless daily schedule is performed as n result of firing.

Section IV. TROUBLESHOOTING

3-8. General

a. Troubleshooting. Troubleshooting shownin table 3-3 contains information for operatorand organizational maintenance and serves asan aid to personnel whose responsibility it isto restore worn, damages, or inoperative ma-teriel to a satisfactory condition. This infor-mation includes both determination of causeand corrective action.

23-9. Schedules for zeroing will be establishedby Theater Commanders.

c. Serviceability, Function Firing Test. Tenrounds, (3 semi-automatic and ‘7 automatic),will be fired in conjunction with zeroing. Mal-functions occurring during these tests shouldbe corrected by referring to troubleshooting,table 3-3.

Note. The letters in the maintenance level columnindicate the lowest level of maintenance at which cor-rective action can be performed. Letter C indicatesoperator and letter 0 organizational maintenance.

b. Zeroing. Zeroing will be accomplished inaccordance with instructions contained in FM

Table 3-3. Troubleshooting

Malfunction Probable cause

Failure to fire _~~~.~._~~~~ Selector lever on safe ________

Broken firing pin ._~~__~~~~__Improper assembly of firing pin

Too much oil in firing pin recessof bolt.

Firing mechanism, lower receiv-er improperly assembled, orworn, broken or missingparts.

Corrective actionMai;;:ee;ance

Move selector lever to semi or Cautomatic fire position.

R e p l a c e ~~~. ~~~~~~_.._~..~ CRemove firing pin and assemble C

correctly. Check retaining pinfor damage.

Disassemble and wipe off excess Coil.

Turn in to direct support main- 0tenance personnel.

19

Table J-3. Troubleshooting-Continued

Malfunction

Failure to unlock (Boltseizes, will not rotatefrom locked position).

Failure t.c extract . . _. _ _

Failure to eject ____ ._.___.

Failure to cock ___. _..__.

Failure to feed _______.___

Double feed _____.__..~Failure to chamber ~. ~.

Failure to lock _.

Probable cause

Carbon,’ dirty or burred boltgroup or barrel extension.

‘Dirty or corroded ammunition

‘Carbon buildup in chamber _ . .Carbon buildup in extractor

recess or extractor lip.Defective extractor, extractor

spring, and extractor pin.‘Badly pitted chamber _ _ _ _ _ . _ _

Broken ejector _______________Frozen ejector ______________._Weak or broken ejector spring. _Short recoil _____________._.__Worn, broken or missing parts

of firing mechanism.Magazine not seated properly-.

Dirty or corroded ammunition - -

Dirty magazine _________._.._Defective magazine __________Too many rounds in magazine_ _

Restricted buffer assembly ac-tion.

Short recoil ___. ~__. .._______D e f e c t i v e m a g a z i n e .Dirty or corroded ammunition _ .

D a m a g e d a m m u n i t i o nCarbon buildup in chamber .Dirt, corrosion or carbon build-

up on barrel locking lugs.Frozen extractor _ _ ~. . .

corrective action

Hold rifle in vertical positionand strike butt eharply onground, while pulling back oncharging handle.

Warntng: Make certain tobe clear of muzzle end.

Caution: Strike butt square.ly on ground to prevenlbreakage of stock, removebolt group and clean.

Note. Brass cases causing a mal-function, if considered seriousenough to warrant EIR action,should be forwarded withEIR.

Remove ammunition from mag-azine and clean.

Clean __________________.____.Disassemble and clean _ _ _ . _ _.

Replace ____________________._.

Turn in to direct support main-tenance personnel.

Replace _..___________________.Disassemble and clean _ _ _ _ _ _ _ _Replace _____________._______.See short recoil.Turn in to direct support main-

tenance personnel.Adjust magazine catch. Push in

the magazine catch buttonwith the nose of a cartridgeand rotate the magazine catchclockwise to tighten and count-erclockwise to loosen.

Remove ammunition from maga-zine and clean.

Disassemble and clean _ _. . _ _ _ _.Change _..__.._______________Caution: Do not load over

20 rounds.Remove buffer assembly and ac-

tion spring. Clean.See short recoil.Change magazine . _ _ _Remove ammunition from maga-

zine and clean.Replace __._..____._.._._.___.C l e a n _. . . .______ ____.._Clean _._._._ _..._______ ___

Clean and assemble correctly

C

C

CC

0

0

000

0

C

CCC

C

*May be indicated by L rim &ear of the cartridge ease.

20

Table 8-Z. Troubleshooting-Continued

Failure to lock-cont’d

Short recoil _____.___.__.

Bolt fails to lock to the rearafter the last round.

Failure to cycle with selec-tor lever on AUTO.

Fires with selector lever onSAFE.

With selector lever onSEMI, fires when triggeris released.

Selector lever hinds _ _ _ . _ _ _

Restricted buffer assemblymovement.

Weak or broken action spring-Restricted movement of bolt

carrier group.

Bolt cam pin missing _ _. _. _ _ _Loose or damaged bolt carrier

key.Improperly assembled extractor

spring.Bent gas tube ____..__..____.

Gaps in bolt rings not staggeredCarbon buildup or dirt in car-

rier key and on outside ofgas tube.

Restricted movement of boltcarrier group or buffer as-sembly.

Missing or broken bolt rings

Gas leakage caused by brokenor loose gas tube.

Dirty or corroded bolt catch _ _

Faulty magazine _. ___________Broken bolt catch and/or spring

Old type buffer installed _ _ _.

Worn, broken or missing partsof firing mechanism.



Lack of lubrication _ _ _. _ _ _. _ _ _.

Corrective action

Remove buffer assembly and ac-tion spring and clean.

Replace _________________.____Disassemble, thoroughly clean

and lubricate. With the upperreceiver held in the uprightposition and the charging han-dle removed, install the boltcarrier group. Slowly slide thecolt carrier back and forth onthe slides of the receiver todetermine proper fit and aline-ment of the bolt carrier keywith gas tube. Inspect forfree movement and completeinsertion of gas tube withinbolt carrier key. If bindingoccurs turn the rifle in to di-rect support maintenance per-sonnel.

Replace bolt cam pin . . .._______Turn in to direct support main-

tenance personnel.Assemble correctly _ _


Stagger bolt ring gaps _ _ _. _. . _.Clean the bolt carrier group and

the outside of the gas tube.

See failure to lock ____.________



Clean. If disassembly is neces-sary turn in to direct supportmaintenance personnel.

Zhange _______________________Turn in to direct support main-

tenance personnel.Turn in to direct support main-


tenance personnel.rum in to direct support main-


tenance personnel.

Lubricate __________.._________

C

CC

CC

C

0

0

C

C0

0

C

21

Section V. OPERATOR MAINTENANCE

3-9. General

This section describes operators mainte-nance of rifles under normal conditions. Formaintenance under adverse conditions refer tochapter 2, section III.

3-10. Disassembly and Assembly

Note. White arrows indicate disassembly and blackarrows assembly.

a. Remove/install bayonet-knife as indicatedin figure 3-7.

b. Remove/install bipod as indicated in fig-ure 3-8.

c. The major groups are illustrated in figureB-2.

d. For disassembly/assembly refer to fig-ures 3-9 thru 3-13.

FLASH SUPPRESSORI

LOCKING CLIP

k_ STUP j WE 16995A

Figure 3-7. Remove/install bayonet-knife.

3-l 1. Inspection and Repair

Refer to table 3-2.

3-l 2. Functional Check

Note. Remove magazine (refer to step 1, fig. 3-9).Pull the charging handle to the rear, make certainchamber is clear.

a. General. A complete functional check ofthe rifle consists of checking the function ofthe rifle while the selector lever is in the Safe,Semi, and Auto positions.

b. Sequence Check. The following sequence

22

WE 60036

Figure 8-8. Remove/install biped.

is used for a rapid complete check. Any por-tion of the check may be used alone to deter-mine the operational condition of any specificfire selection.

Note. Disengage takedown pin and open receivers.Hammer shall be in the cock position.

(1) Safe Position. Pull trigger, hammershould not fall.

(2) Semi-Position. Pull trigger, hammershould fall. Hold trigger to rear, recock ham-mer and release trigger. Hammer should trans-fer from hammer hooks and disconnector tothe hammer notch and trigger nose.

(3) Auto Position. Pull trigger, hammershould fall. Hold trigger to the rear and recockthe hammer. Upper hammer hook is now en-gaged with the automatic sear. Hold trigger tothe rear, push forward on automatic sear.Hammer should transfer to trigger nose. Holdtrigger to the rear, recock hammer, release

Remove/install magazine.

;\PUSH IN TO RELEASE

MAGAZINE BASE CATCH -de,

BASE __,vREMOVE *

Release magazine base. Remove/install base.

0’.NOTE: APPLY ZMl-FLUID LUBRICAT-ING OIL (LSA) TO MAGAZINE SPRING,WITH A DAMPENED CLOTH, BEFOREINSTALLATION.

CAUTION: NO OTHER COMPONENTTO BE LUBRICATED.

MAGAZINE. .

NOTE: TURN FOLLOWER TOA SLIGHT ANGLE WHENREMOVING OR INSTALLING .

Remove/Install spring and follower.

Figure 8-9. Disassembly/assembly o f r i f l e . (1 of 5)

swr\IG

4bIWE 17374A

23

N O T E : D O N O T R E M O V E F O L L O W E RF R O M S P R I N G .

Base, spring and follower removed from magazine.

Open bolt and inspect chamber.

Disengage/Engage take-down pin.

PULL DOWNO N S L I P R I N G

Remove/lnstaIl handguards.

_. _. ._--.

C H A R G I N G H A N D L E

Withdraw/Insert charging handle and boltcarrier and key assembly.

WE 17375

Figure J-10. D i s a s s e m b l y / a s s e m b l y o f r i f l e . (2 of 5 )

2 4

910

\ BOLT MUST BE INU N L O C K E D P O S I T I O N

\ \ FOR ASSEMBLY

Remove/Install bolt carrier group.

CAUTION: When assembling, firing \pin is to be in the forward position.Retaining pin is to be installed inback of large shoulder on firing pin.

.\e retaining pin when installing.

Remove/Install firing pin retaining pin.

-. .- --Place bolt in lock position.

,-Remove/install f i r i ng p in .

W A R N I N G : M A K EC E R T A I N C A M P I NI S I N S T A L L E D .

Remove/Install bolt cam pin.

Figure S-11. Disaasembl~/assembly of rifle (9 of 5)

WE 60045

2 5

RINGS

*’:

NOTE: WHEN INSTALLING BOLT, MAKECERTAIN RING GAPS ARE STAGGEREDTO PREVENT LOSS OF GAS PRESSURE.

Remove/Install bolt from bolt carrier and key. Bolt carrier group parts.

-CAUT ION: WHEN THE FIRING PIN IS USED ASA D ISASSEMBLY TOOL , EXTREME CARE SHOULDBE USED TO PREVENT DAMAGE TO THE T IP .

Remove/Install extractor pin.

Remove/Install sling.

BOLT CARR IER AND KEY

F I R I N G P I N

F I R I N G P I NR E T A I N I N G P I N

;wS P R I N G

CAUTION: Extreme care should be used to insurethat the extractor spring and retaining pin are n o tdeformed or lost during cleaning operations.

NOTE: The extractor spring should not be removedand removal of the extractor is authorized for _cleaning purposes only.

Remove/lnstal I extractor and extractor spring.

Remove/Install charging handle.

WE 19646

F i g u r e ~12. Disaaaembly/aaaembly of rifle. (4 of 5)

2 6

Disengage/Engage receiver pivot pin.

LOWER RECEIVER GROUP

Separate/Join upper receiver and lower receiver groups.

FER ASSEMBLY

Press in buffer assembly, depress buffer retainer,and then release buffer assembly.

Figure 3-13. Disassembly/assembly of rifle. (5 of 5)

Remove/instaf I buffer assembly and spring.

WE 19647

27

trigger and push forward on automatic sear.Hammer should transfer to the sear engage-ment. Move selector lever to “safe” or “semi”position. Close receiver and engage takedownpin.

“safe” or “semi” position before closing re-ceiver, will damage automatic sear.

Caution: Failure to move selector lever to

(4) Semi-Positian. Pull charging handleto the rear. Make certain chamber is clear,then release charging handle. Pull the trigger,hammer should fall.

Section VI. ORGANIZATIONAL MAINTENANCE PROCEDURES

3-13. General tenance procedures for the rifle and bipod.

This section describes organizational main-Refer to table 3-4.

Table Z-4. Organizational Guide to Maintenance of Individual Groups or Assemblies

Groupor

assembly

Magazineassembly.

Bolt assembly _

Upper receivergroup.

Lower receivergroup.

Bipod _________,

Fig. 3-9 _.....

Fig. 3-11 ..____

Fig. 3-13 __...

Fig. 3-13 . . . .

Fig. 3-8 _.....

‘Fig. 3-9 and3-10.

‘Fig. 3-14 __._

‘Fig. 3-16 and3-16.

Inspection and repair

1. Inspect tube for bulges, dents or damagedfeeder lips.2. Inspect spring for kinks, cracks or breaks.Replace magazine assembly.3. Inspect follower and bore for excessive wear,cracks or being bent. Replace magazine as-sembly.1. Check for cracks in bolt especially in area ofcam pin hole, condition of locking lugs, pittedor chipped bolt face and elongated firing pinhole. If broken evacuate to direct support main-tenance personnel.2. Inspect for broken bolt rings, make certainring gaps are staggered. If broken or deformed,evacuate to direct support maintenance person-nel.3. Inspect for worn ejector, spring, and pin.Replace.1. Inspect for cracks and parts for wear. Eva-cuate to direct suport maintenance personnelif parts are worn or damaged.2. Inspect receiver for condition of finish. Ifscratched or worn (shiny bright) remove alllubricant from surface and touch up withprimer and lacquer listed in table 2-2. If cor-rosion is present turn in to direct support main-tenance personnel.3. Inspect charging handle for damage andlatch spring for tension.1. Inspect pistol grip for cracks and fordamaged screw and washer. Replace.2. Inspect stock assembly. If cracked ordamaged, replace.Note. Cracked stocks will be evacuated to directsupport maintenance for repair.3. Inspect takedown pin, pivot pin, selectorlever, detents, and springs. If worn or damaged,replace.4. See 2 above under upper receiver group.5. Inspect lower receiver extension for service-ability.Check spring tension of jaws.

- -

Cleanina

Table 3-l.

Table 3-l.

Table 3-l.

Table 3-l.

Table 3-l.

*White arrowm on illustration indicate disassembly and black arrows indicate assembly.

2 8

SPRING

EJECTOR-. _.._ _. -. . _

Remove/Install ejector pin. Remove/install ejector and ejector spring.

WE 19736

Figure 3-l.& Dka88emb~y/a88emb~y of bolt assembly.

Remove/Install pistol grip screw.

CERTAIN DETENT $SPRING IS POSI-TIONED PROPERLYTO AVOID ,DAMAGE.

NOTE: WHENASSEMBLING THESTOCK MAKE

Remove/lnstaI 1 buttcap screw.

SELECTOR LEVER

NOTE: APPLY SEMI-FLUID,LUBRICATING OIL (LSA)TO DETENT AND SPRING

SCREW BEFORE INSTALLATION.

Remove/Install lockwasher, pistol grip, selectorlever detent and spring (ejector spring).

NOTE:REMOVAL ANDINSTALLATIONOF SPRING PINAND SWIVEL ON

PPER RECEIVERROUP IS ALSOUTHORIZED.

- S P R I N G P I N

SWIVEL

Remove/Install stock assembly, springpin and gun sling swivel.

NOTE: APPLY SEMI-FLUID aLUBRICATING OIL (LSA)TO TAKE DOWN AND PIVOTPINS, DETENTS AND SPRING!5,BEFORE INSTALLATION.

Iw&PIssdetent whenremoving/installingDivot oin.

s-: DETENT

Remove/lnsthlI springs, detents, take down pin and pivot pin.WE 19648

Figure S-15. Disassembly/assembly of lower receiver group.

30

l/16 I N . S O C K E T H E A DCAP SCREW KEY OR DRIFT

N O T E : F I L E E N DAPQROXIMATELY45 DEGREES.

Tool for removal of detent pin.

T O O L

y

Rotate detent pin l/4 turn and remove tool.

LY AND COM-PRESS DETENTIN RECESS OFRECEIVER ANDI N S T A L L P I N .

Install detent and pivot pin.

Inserting tool in slot of pin to compress detent.

1 LOSS OF DETENT AND SPRING.-1

Remove pivot pin.

Install detent spring.

WE 60217

F i g u r e 9-16. Disassembly~assembly of lower rece iver group . (Old deszgn pwot pzn)

3 1

Documents

WARNING DANGEROUS SOLUTIONS WARNING DANGEROUS …