Rifle, Automatic, Browing, Caliber.30, m1918a2 MIL-R-1167A

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ML-R–1167A1JULY195S

SUPERSEDINGMILR-116722July1949

MILITARY SPECIFICATION

RIFLE,AUTOMATIC, BROWNING,

CALIBER .30,1918A2

This specification has been approved bg the Department of Defensefor use of the Departments of the Arnw, the Navu, and the Air Fovce.

L SCOPE

1.1Thisspecificationoversone typeof

gas-operated,agazinefedautomaticrifle.

2.APPLICABLE DOCUMENTS

2.1The followingpecifications,tandards,

and drawings,oftheissueineffectridate

of invitationorbids.form a uartof this

specification:

SPECIFICATIONS

MILITARY

MIL-W-13855-Weapons,mallArms,

GeneralSpecificationor.

STANILIRDS

MILITARY

MI&STD–105-Ssmpling Procedures

and Tables for Inspectionby At-

tributes.

DRAWINGS

ORONANCE CORPS

51–102-1A —List of Drawings and

Specifications Rifle,AutomatiG

Browning,Cal..30,M1918A2...

(Copiesfspecifications,tandards,rawings,ndpublicationsequiredy contractorsnconnectwithspecificrocurementunctionshouldeobtainedromtheprocuringgencyrasdirectedythecontractingflicer).

3.REQUIREMENTS

3.1Designandconstruction.

3.1.1General.— Components and as-

sembliesshallconformtothematerials,i

mensions,toleranceimits,eat treatmentfinalprotectiveinishes,nd degreeof snr

faceroughnessspecifiedn the applicab

drawings,and shallbe in accordancewith

SpecificationIL-W-13855.

3.1.2Marking.— Uidessotherwisespeci

fied,achriflernd eachcomponentthereo

forwhichmarkingsareprescribed,hallbe

clearlymarked in the positionsnd type

sizesspecifiedn the applicablerawing%

and in accordancewithSpecificationIL

W-13855.

3.1.3awet.— Thechamberandboreshaf

be smooth and freefrom scratches,its

rings,and otherdefects.he landsshallbe

sharp and welldefined.nrrs and sharp

edgesshallbe removedfrom theedgeofthe

chamber.

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MD-R-1167A

3.1.4WTGZ and recetver assembly. The

barrelshallbe drawn up tightly,nd the

draw lineshallqualify.

3.1.5Biped asssmbly. — The bipedas-

semblywhen open shallnotsway sideways

onthebipedbearing,nd shalle capableofbeing rotated.Thebiped legs,in either

shortenedr extendedlength,hallhave no

appreciable loosenessand sbal]be heldsecurelynpositiony thethumbscrews.

3.1.6olt assembly. — The boltshallove

freelyntheboltguidesinthereceiverith-

outtendencytobindor stick.he boltlock

shallprovidepositiveockingithno appre-

ciablelay,andshallreventrearwardmove.

ment of theboltuntilunlockinghas been

accomplished.

3.1.7Change lever. The changelever

shallmove freelyfrom one positiono an-

other,operateas intended,nd remainse.

curelyin place.With thechangeleverset

at “S”, the rifleshallnot firewhen the

triggerispulled.

3.1.8h’xt’ractor spring. — ‘l’he extractor

springshallassemblefreelyintothe ex-

tractorndboltwithoutbindingatanypoint.

3.1.9Firing~“n.— The firingpin,point

shallbe smoothand wellrounded,aid shall

notbe hand stoned.

3.1.10orearm.- The fores,rmshallbe

smoothandwellsanded.Smallchecks,racks,

andknotholesotappearinginsectionsikely

tocauseweaknessshallbefilledithplastic

wood,shellac,r othersuchmaterialafter

aPPrOvalOf theinspector.ightstreaksinforearmsshallbe treatedtoblendwiththe

remainderof the componentto producea

uniformcolor.orearmsshallbe immersed

for an adequatelengthof time in an ap~

proved oilas specifiedn the applicable

drawing.Substitutionfmaterialtherthan

thatindicatedn thedrawingsmay bemade

onlyuponapprovalbytheprocuringgency.

2

3.1.11fagazine, The magazineshallfit

easilyintothe receiverand shallbe held

securelyy themagazinecatch.mpty mag-

azinesshalldropoutofthereceiverhen the

magazinecatchisoperated.

3.1.12Ai’agaz{neatch.— The magazinecatchshallsecurelyoldtheloadedmagazine

inposition.

3.1.13‘Receiverassembly.— All com-

ponentsofthereceiverssemblyessentialo

-fieldtrippings~allassembleand operate

by hand,but withoutlooseness.

,3.1.14ights. ~

3.1.14.1ront sight. — The top of the

frontsightbladeshallbe atrightanglestothe sides,nd shallbe smoothand clearly

defined.

3,1.14.2ear sight assembly. The rear

sightassemblyshallassembleproperlyinto

thedovetailedeceesnthereceiver.he leaf

assemblyand itscomponentsshalloperate

withoutappreciableoosenessrplayatany

point.,,

[email protected] slidessembly

shallmove freelythroughoutitsrangeoftravelwithouttendencyto bind or stick,

and thesearengagingnotchshallbe smooth

and knifeorwireedgeremoved.

3.1.16Frigge~~ardassembly. Thetrig.

ger guard assemblyshallfitfreely,ut not

loosely,n the receiver.here shallbe no

appreciableideplay.

3.1.17ycticate. — The rateoffireith

the changeleversetas shown belowshall

conformtothefollowingequirements:

Range

Lever set on low rate (F)..........300450R.P.M.Lever set on high rate (A)..: ..... 500–650 R.P.M.

3.1.18Fir{ngi%jrotrus-ion.The firing

pinprotrusionhallbe as specifiedn the

applicablerawings.

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3.2Triggerpull. The triggerPUH shall

be smooth,freefrom objectionablereep,

andshallewithintherangespecifiednthe

applicablerawing.Thereshallbe no alter-

ationof any component beyond the pre-

scribed.olerancesn ordertomeet tbetrig-

gerpullrequirements.

Note.—’’Objectionable creep” is” interpreted tomean any perceptible rough moyement in the trigger

Pull between the time the slack is taken up and the

sear is released, with pressure applied to the trigger

at a uniform rate of increase over a period of not

less thmi 3 seconds,

3.3 Interchangeability. — All components

and assemblies on lists supplied by thepro-

curingagency,which substantiallyontain

thosepartsmaintainedfor replacement&

shallbe interchangeable.See6.1).

3.4 Impact resistance.plastictocksndassembledrifles shallbe capableOf with-

standingthedropand impacttestsspecified

on the,applicablerawings.

3.5 Breaching”pace.Before prooffiring,

the breechirigpaceshallbe as shown on

theapplicablerawing.The breachingspace

ehall,otincqease”morehan0.001nchasaiesuItof prooftiring.owever’,hOu~dthis

dimensionbeexceeded,secondproofround

shallhownofurtherincrease.nnoinstance

shallliebreechingpace,chamber,and bore’dimensionsafterproof firingexceedthe

limitsspecifiedn tbedrawings.

3.6Functioning- Eachriflendmagazine

shallfunctionsmoothlyand properlyunder

firingonditions.,.

3.7Targetingandaccuracy. Rifleahall

meetthe targetingand accuracyrequire-

ments specifiedn tbe targetingdiagram

shown on theapplicablerawing.

3.8Endurance.— Riflesnd magazif!es

shall.avedependableendurancelivesfthe

specifiedumher:of :rounds (see4.3.8.1)

withoutsubsti~utionfany components,nd

withoutmalfunctionsr nonacceptableon-

ditions,n excess,ofthe limits.hown in

TableI. ;- ,

MIL-R-1167A

3.9Workmanship.— Finishedrifleshal

befreefromdefectshatmay affectppear

ance,serviceability,peration,and func

tioning.

TABLE I. — Malfunctions, ?zonacceptableconditions,and unserviceable components

I N.

M.lfurmtiomandnm.-acce.te.b!e ~bep::

cmditims,

( .ttribnte.ble to tif le )First6,000m“.dl

Change lever fails to function . .... .... . 0

No

Charred forearm ................................. penalt

Enlarged firing pin hole . . . . o

Failure to close (due to any rifle

component). a

Failure to eject ...........7........................ 1“

Failure to extract ............. ......... ........ o

Failue to feed (bullet striking .,.

face of barrel). 1°ailure to feed (insufficient recoil) . ~~ O

Failureoseartoreleaseolturingslowrateffire. s

Failureftriggerorelease(anycause). o

Faulty trigger pull ....... ... ....... .......... o

Head space (increase from start of

endurance test). 0.002Han@irenoticeable)...................... oLmsestock............................................ oLoosearrelnd receiver ................... 0

Misfire .................................................... o

Piercedrimers.................................... oPartialtiition....................................oRupturedartridgease. . oUncontrolledire.................................. oWorncylinderausingasleak . . 0Othermalfunctionstotal. . 1

IBarrel (eroded) ... ... ... .. . .. .. ... ... ..... .. o

Bolt broken ........................................... o

Bolt; burred .................................... ...... 1

Bolt, abnormal wear on bearing

surf aces. 1

Ejector binds on bolt . ... ...... ...... . .... o

Ejector, broken, burred or bent . . 0

Extractor broken ................................ o

Extractor burred . . .. 1Firing pin, broken . . . . .. o

ImProper fit, gas cylinder tube

and braket. o

,..’

din

“e tea

Sfm”d

6,000I’.””*

:0

enalty

o

0

2

0

00

8

0

No

enalty

0.000001

10

1

0

0

3

No

enalty

o

1

20

0

0

1

1

0

3

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MIL-R-1167A

TABLEL- d4aCfwLctiOm,onacceptable coxditiom,and umervkxtble mmponents~ontiwued

Unaewi.abl% .cm,t....nt.

(Co.t<m,.d)

Loose fit, ejector and bolt

Loose or worn bolt supports .Piston binds . .

Sear broken .

Sear contacts, defective .

Firing pin, defective .

Set back in bolt .

Weak ext=aetor spring

Weak recoil spring . .

Worn locking surfaces, bolt lock,and receiver.

All other unserviceable component8

Magazines

Bent lips, bums, m sharp edges cam.ing excessive scraping of metal

from cartridge case.

Failureofeed(bentips)Failureoeed (dented, burred m.sharp edges)

Follower m follower spring fails to

function.

Worn magazine catch notch

Number

wrmi lted in

,. e“du

Fimt

6,000

..”.39

0

00

0

0

0

0

0

0

0

0

0

0

0

0

0

me tit

kcond

5,000

rounds

1

0000Norealtyo10

04

0

0

0

0

0

IN.te.—When malfunction. (with,” the allowance .1 Table 1)

a.,, traceable to wrti.,,tar cc,mr.c.”,nt+ 1, i$ mrrnisdbl. to

,,,1,., such mmwn,nta and record then, es un,,rvlcm.ble,

nubk.t tm limitations of Table 1. When it is dtinitely eatab.

]ished by HI. im.ector that ,re”io”sl, recorded nwlfu”ctio”.

.,, attributable @ an w,sa”ieeA1e emqmnemk, math =m.lfu”c.

tions shall not be counted Q.ga[.ast the rifle be!.= tited, provided

that they .xcurred not more UIP.11 200 rounds prior tn MFJ.CQ.

ment of the un.ervicesble cnmD.xIe.t. However s.oh m.lfunc.

tlc.m mhall remain recordeA and F.rc.Derl, Menti.%d.

4. QUALITY ASSURANCE PROVISIONS

4.1Sampling.

4.1.1ot. — Unlessotherwisespecified,

lotshallconsistfnotmore than500rifles

fortheinitialotand 1,000riflesoreach

subsequentlot.

4.1.2nspection sample. — The inspecter

may subjectallorpartofany lotorlotsof

componentsorassembliesosuchinspection

as he deems necessaryodeterminecompli-

ancewith,hisspecification.nlessotherwise

~

specified,nspectionamplesizesshallbe in

accordanceithStandardMIIXTD–105.

4.1.3Testsamples.— Unlessotherwise

specified,henumber oftestsamplesshallbe

asspecifiedoreachtest.

4.2Inspection.

4.2.1Contractor’s inspection. — The con-

tractorhallaintainan adequatesystemof

processing,nspection,nd lotidentification.

Onlysuchlotswhichmeettherequirements

of thisspecificationhallhc submittedfor

finalGovernmentinspection.

4.2.2rocedure. — Rifleshallbe visually

inspectedorcompletenessf manufacture,

assembly,finish,and workmanship.The

chamberandboreshalleexaminedforrust,

pits,powder fouling,urrs,and otherde-

fects.Riflesshallbe operatedby hand to

ascertainthat the finaladjustmentshave

beenmade toassureproperoperation.om-

ponentsshallbe inspectedas necessaryto

assurecompliancewith drawing require-

ments.Beforefinalacceptanceof any lot,

theinspectorhallmake whateverfinalin-

spectioneemednecessaryoassurethatthe

riflesaveundergoneallinspectionndtests

prescribedherefor,nd thattheriflesave

been thoroughlycleanedand preparedfor

shipmentas requiredby Section5.

4.3Tesk.

4.3.1eneral.

4.3.1.10t2t?_a.ctOfls respow~bili iv.—unle~s

otherwisepecified,lltestsspecifiederein

shallbe performedby thecontractornder

thesupervisionfa Governmentinspector.

4.3.1.2mmunition. — Unlessotherwise

specified,mmunitionusedinallfiringests

exceptingheprooffiringestshallbeU. S.

Governmentcaliber30standardserviceall

ammunition.Ammunition usedin prooffir-

ingtestshalleGovernmentstandardcaliber

.30highpressuretestammunition.




4.3.2Triggerpidttest.— Each riflehalf

betestedortriggerullusinga deadweight

attachedto a hookedwire.The prescribed

weightsshallbe appliedas specifiedn the

applicablerawing.The triggerhallecare-

fullycheckedfor“objectionablereep.”

4.3.3nterchangeability test.

4.3.3.1 Sample.— Ten rifleselectedythe

inspectorrom eachlotshallbe testedfor

interchangeabilityf likecomponentsand

assemblieshich are likelyto requirere-

placement.Testfrequencymay be reduced

by thecontractingfficerhen a recordof

consistentlyatisfactoryesultshas been

established.

4.3.3.2rocedure. Componentsand as-sembliesreadilydisassembleds shown in

the listto be furnishedby the procuring

agency shallbe disassembledfrom the

weapons.Componentsand assembliesfeach

kindshalle placedtogethernd mixed.The

rifleshallbe assembledwithoutfittingr

alteringny componentinany way except

thathandfittingillbe allowedon notmore

than2 oftherifles,rovidedthat,aa result,

no compouentor assemblyisrenderedun-

suitableorassemblyinotherrifles.he 10

aasembledrifleshalloperateand functionproperly.

4.3.3.3t leasttwo of the above reas-

sembledrifles,rom which allcomponent

includedas “SpareParts”inthelisttobe

furnishedytheprocuringgencyhavebeen

removed,shallbe asssmbled,using com-

ponentsintendedfor use as spareparts.

Thereshallbe no handfitting,nd tberifles

shalloperateand functionroperly.

4.3.3.4llof the riflesssembledfrom

interchangedomponentsshallbe subjected

tofunctionndtargetingnd accuracy firing

tests.

4.3.4 Drop and impacttests.—Drop and

impactteatsshalleconductednthemanner

specifiednthe applicablerawings.

MIJXM167A

4.3.5 Proof fitingtest.Each assembl

rifle,parebarrel,eceiver,ndboltassembl

shallbe subjectedothefiringfone hig

pressureproofcartridge.uitabletlxtur

forprooffiringaparecomponent and as

semblieshallbe providedby thecontract

The persondoingtheprooffiringhalllac

theprescribedroofmarks on eachaccept

barrel,eceiver,nd boltimmediatelyafte

thetest.

4.3.6Functionfiringest. Unlessothe

wisespecified,ach riflehallbe fired12

roundsinthefunctioniringest,sspecif

inTableII,usingfullmagazinetypeofburs

TABLEII. — l’tmctiti jirkg

Rounds I‘-””r’chg::+ ’’””””

40 Large “*,, High

40 Large “F” Reduced

201 Medium “A” High

20 Medium ‘T’” Reduced

1 Using a full mwa.i.e, evem third rifle nhall fire them 2

round. in short bursts of 4 to 6 rounds. t. check . . inter.

rnittent lid... The .auantitr of rifles fired ehall be I.cressfd

at the di,.retion of the ,murinE are.., in the event o

failure of rifles ta meet this tfat.

4.3.7Targetingand accuracytest firing.— Riflesshallbe testedfor targetingnd

accuracyin accordancewith theapplicab

drawing.

4.3.8ndurance test.

4.3.8.1an@e. — One rifleelectedy th

inspectorrom the initialot,found sati

factoryinothertesta,hallbe considereds

a representativeeapon and shallbe sub

jectedtoan endurancetestof10,000reunds

One rifleo selectedrom eachsubseque

lotshallbe subjectedoan endurancetestof

5,000rounds.Sufficientagazinesshallbe

selectedorthetestso thatapproximate

500 roundsshallbe fired,nrotation,rom

eachmagazine.At thediscretionfthecon

tractingfficer,nitialotsof riflesn cOn

tinuationontractscontractsoraddition

5




MIL-R-1167A

quantities,roductionof which startsim-

mediatelypon completionf previouscon-

tracts)ay reconsideredssubsequentots.

4.3.8.2rocecZcwe.-Mediumasportshall

be usedthroughouttheendurancetest.alf

ofthetestshallbe firedsingthefastcyclic

ratesettingand halfshallbe firedusing

theslowcyclicatesetting,ursteshaRnotexceed100 rounds(burstof100 roundsis

consideredomean 5 magazineloadsof 20

cartridgesach,firedconsecutively).he

riflehallbe cooledby eitherwateror air

aftereach100roundeoffiring.are should

be exercisedopreventwaterfrom entering

thegas portor cylinder.

4.3.8.3he rifleaybe cleanedand oiled

aftereach500roundsoratthecloseofthe

day’sfiring,ut no partshallbe alteredor

replacedxceptthatpartsbrokenorworn totheextentthattheyareunserviceablehall

be replaced. recordof eachreplacement

shallbe kept.

4.3.8.4pon completionftheendurance

test,heriflehallbe inspectednd allde-

fectiverworncomponente replaced.efore

acceptance,heriflehallbe thoroughlyon-

ditionedttheexpenseofthecontractor,nd

shallbe functionfired20 roundswith the

changeleversetat “A” (highrate),and

testedfortargetingnd accuracy.

4.4Reinspectionnd retests.

4.4.1efective ammunition.— Malfunc-

tionsinany testtraceableodefectivem-

munitionshallnot be countedagainstthe

rifleeingtested.

.4.4.2ejections. — Riflesrejectedindi-

viduallyrby lotsbecauseof inspectionr

any testexceptthe enduranceand inter-

changeabilityestsmay be conditionedndresubmittedorinspectionr testinwhich

failureoccurredand suchotherinspection

ortestsastheinspectoray considereces-

eary.

4.4.3nclurancestest.Ifthe rifleep-

6

resentingny lotfailstomeet thespecified

requirementsntheendurancetest, retest

shallbe made,unlessin theopinionofthe

inspectorhefailurerfailureendicateeri-

ousdefectsntherifles,nwhichcaseretest

shallbe made onlyifauthorizedy thepro-

curingagency.In casea retestsmade,the

inspectorhallselectanotherriflefor the

purposefrom the lotunder consideration.Ifa reteetisnotmade or therifleelected

thereforfailsin theretest,helotshsllbe

rejectedubjecttoconditioningnd further

test.

4.4.5nterchangeabi2it~ retest. — Ifthe

riflesepresentingny lotfailto meet the

epecifiedequirementsin the interchange-

abilityest,helotshallbe rejectedubject

toretestftwicethenumber ofriflesswere

intheoriginalample.

5.PREPARATION FOR DELIVERY

5.1Unlessotherwisepecified,reservation,

packaging,acking,and marking.— Rifles

andsparepartsshallepreserved,ackaged,

packed,andmarked inaccordanceithpack-

aging instructionsitedon Drawing 51–

102-1A.

6.NOTES

6.1Orderingdata.— Procurementdocu-

ments shouldspecify:

(a) Title,number, and,date of this

specification.

(b) Listofinterchangeableomponente

and assemblies.See3.3).

(c)”Placeof inspection.See6.3).

(d) Preparationordelivery,fdiffer-

ent.(See5.1.).

6.2When orderingammunitionfor the

targetingndaccuracyteet,rocuringagen-

ciesshouldrequisitionmmunitionofan ac-

curacysuitabieorthepurposeintended.

6.3Unlessotherwisedeemed necessary,’

placeof inspectionhouldbe attheplantof

theprimecontractor.




Notice.—Thispecification,ogetherithspeci-ficationsnddrawingsertainingo it and bearing

a<’Notice”of similar restrictions, is intended for use

only in connection with procurement by the United

States Government, and shall not be reproduced

either wholly or in part except when authorized in

connection with Government procurement, nor be

used for any other purpose except when specificallyauthorized by the Chief of Ordnance.

MIJ.,4G1167A.

Cnstodi.ns:

Army--ord..me Corps

N.vy—Bureau of Ordnance,

Air Force

Othernterest:Navy-Me

*U. S. GOVERNMENT PRINTINQ 0FF1CE:88179618 $6(38)

7


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Rifle, Automatic, Browing, Caliber.30, m1918a2 MIL-R-1167A