Description Madsen

7/30/2019 Description Madsen

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1.: CONTENTS

I. DESCRIPTION OF TH E GU N o o . o . o . o 51. The fixed parts . . . . . . . . . . . . . .. . ..... . .. ........... . .0.. . 520 Th e recoiling parts 0 .... 0. 0 . 0 . 0 ... . ......... 0. ........ 630 The trigger gear o . . . . . . . . . . . . . .... . .. . . . . . . . . . . . . . 0 o. . .. . 740 The recoiling and percussion mechanism . . . . . . . 75 . The safety device .. . ....... . .. ................... 0.... . . .. . 96 . The breech block and its movements .. . .. . .0 . 0.... .. . 970 The cartridge feeding mechanism 0 ...... 0. 0. .. . 0. 0. I 080 The ejection mechanism o 0. 0 ..... 0. 0. 0.... 1290 The firing mechanism .......... o . . .. . .. . . o.o o o o 13

10 0 The magazine 0 ... . .. . ..... 0 .. . ..... .. ... . . .. .0 .... . . . . .0 14II. ACTION OF MECHANISM WHEN FIRING . .. . .. 16Loading o.......... . . . . . . . .. . . . . . . . . . . . . . . . . . . . . . . .. .......... .. .. 16

Firing o ooo o 17Unloading 0 . 0 ..... .. .... 0 ... . .0. 0 ... 0 ... ... . ... 0........... 18

III. STOPPAGES AND THEIR REMEDIES o 2010 Jams .... . . . .. o . . . . . . . . . . . . . o .. . .. .. .. . . .. . .. . . .. . . . . . . .. 2020 Faulty closing .. ........ .. .. ........ . ........ .. .... ... .. ..... 2130 Faulty ejection .. ...... .. .. .. . .. ........ .. .. .. .... .. .. .. .. .. . 2140 Misfire 0000 ... . ........ . ........ .0 . . . . . . . . . . . . . . . . . . . . 2250 Faulty cartridge feeding .. .. .. .. .. . .. . .. .. .. .. .. .. .. .. ... 2260 Empty case in ejection way .. .. .. . .. .. .. .. . . .. .. .. . . .. 23


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IV. FIGURES No. 1 TO 7 OF TH E MADSEN MACHINEGUN M. 1940.

V. NOMENCLATURE AN D PHOTOGRAPHS of parts,accessories and tools for the MADSEN Machine GunM. 1940. Plates 1-X.

VI. DIMENSIONS, WEIGHTS etc. of MADSEN MachineGun M. 1940.

VII. KEY TO NOMENCLATURE.

.

I.DESCRIPTION OF THE GUN

The MADSEN machine gun is an air-cooled weapon andconsists of :

the fixed parts andthe recoiling parts.The working of the gun is brought about as follows : the re

coiling parts under the pressure of the powder gas and a systemof springs move backwards and forwards within the fixed parts this is caused by the powder gas pressure on the base of thecartridge being transferred through the breech block to the re-coiling parts ; when firing ceases, the recoiling parts are in theirrearmost position with the chamber empty.

1. The fixed parts.(Fig. 7).Th e principal fixed parts are the barrel casing ( 104) and the

frame ( 1) which are screwed together , and the trigger plate(65) and stock (96). These two latter parts are connected bymeans of the stock screw (98) and they are made fast to theframe ( 1) by means of the frame bottom bolt ( 141) and theframe lid locking bolt (22).

On the left side of the frame (1) is the magazine receiver ;mounted on the trigger plate is the trigger gear and the organsfor regulating the movements of the recoiling parts.

At the top the frame is closed by the frame lid (2). In itsunderside the trigger plate has an opening for the passage of


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6empty cases, which can be closed by the flap-shaped spring-controlled deflector (92).

On the fore end of the barrel casing is the flash absorber(381). On its upper side is the foresight base with the foresight(31 ), and farther back the rear sight base (23 ) with the rearsight leaf spring (26), leaf (24) with the slide (27) and notch.On both sides the leaf has a graduated scale from 200 to 1900metres.

On the underside of the barrel casing rowards the muzzle aretwo struts which can be folded back along the casing ; they areadjustable for length and are joined together by a jointed staywith a wing-nut, by means of which the struts can be clampedback in the unused position.

At the middle of the upper side of the casing there are studsto hold the clamp of the gun mounting when the gun is to be placedon it. A little farther back on the right side is the carryinghandle ( 592) , which is secured to the barrel casing by meansof the carrying-handle ring (598) in the hinge of which thehandle can be folded up and down.

The barrel casing is also designed to take anti-aircraft sights;a separate description contains particulars of the constructionand mounting of these sights.

Near the toe of the stock (96) is the stock elevator socket(197) and wing nut, and on the right side of the stock a holderfor the periscope, which can be used when firing over cover.

On the left side of the trigger plate is the sight-post for mounting the elevation clinometer for use in indirect fire.

2. The recoiling parts.(Fig. 7).

The main details of the recoiling parts ar e the barrel (43),the breech ( 44) and the breech block (59) .

7The breech (44) , into which the barrel is screwed, is in the

form of an oblong frame holding the breech block (59), whichmoves inside the breech round the horizontal breech blockbolt (61).

The fixed parts and the recoiling parts are connected togetherby the recoil arm (69) , which is mounted on the horizontalcrank axle bolt (68) and the head of which engages in a groovein the link (47 ), which is immovably connected with the breech(44).

3. The trigger gear.(Figs. I, 2 and 3) .

The trigger gear is placed inside the trigger plate (65). Itcomprises the trigger guard (79), the trigger (80) and triggerspring (81). Th e trigger guard has a seating for the trigger rodpin (87) on which the trigger works. Th e finger-piece of thetrigger extends down into the trigger guard , and in addition thetrigger has a forward pointing arm which is pressed upwardsby the trigger spring, and which on its upper side has a nose(80A) to engage the notch in the recoil arm (69).

The trigger rod (85), which turns on the trigger ro d pin tothe left of the trigger , has on its upper side a nose (the sear) tofit into the notch of the percussion arm (70). At its fore endthe trigger rod and also the forward pointing arm of the triggerare cut away to allow the safety catch (91) to be turned in underthem.

4. The recoiling and percussion mechanism.(Figs. I, 2 and 3).

The backward motion of the recoiling parts is braked by therecoil arm (69) together with the recoil spring (75) and thepercussion arm (70) with its spring (76) working together, andat the end of the recoil the parts are thrust forward again by therecoil arm and spring alone.


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8The recoil arm is mounted on a four-sided seating on the

crank axle bolt (68) and is thus fixed to it and moves with it.At its fore end the recoil arm has a head which engages in a

groove in the link ( 47) , thus forming the connection betweenthe fixed and the recoiling parts of the gun.

At the rear the recoil arm has seatings for the two studs onthe recoil spring plunger (74) , and below these a notch for thenose of the trigger by means of which the recoiling parts areheld in the rearmost position when the pressure on the trigger isreleased.

The recoil spring (75) is compressed during the recoil between the percussion and recoil spring base (78 ) in the triggerplate (65 ) and the shoulder on the recoil spring plunger ; thiscompression checks the recoil of the moving parts and sendsthem forward again at the end of the recoil as long the trigger1s kept pressed.

On the boss of the recoil arm is the trigger stud (69A) ; dur-ing the final part of the forward movement this stud depressesthe trigger rod , thus releasing the trigger rod nose (85A) outof the notch in the percussion arm, which is thus released andthen strikes.

The percussion arm (70 ), which turns on the crank axle bolt(68) , has at its rear end seatings for the studs of the percussionspring plunger (77) below these a notch for the trigger rodnose (85 A), and at the fore end a head which at the momentof firing impacts on the hammer (48).

The percussion spring (76) lies round the percussion springplunger in the same manner as the recoil spring and plunger,and is compressed between its shoulder and the spring base(78).

95. The safety device.

(Figs. I and 2).Th e safety catch (91 ) consists of a transversal bolt with a

radial cam . When the recoiling parts are in their rearmostposition the safety catch can, by means of a finger-piece on theleft side of the trigger plate (65) be set at three different positions, marked from below: " F" , "D " and " S" .

In position "F" (ready to fire) the cam slopes obliquely upwards and forwards , so that both the forward-pointing arm of thetrigger and the trigger rod are free and can move downwards.

In position "D " (discharge) the cam is vertical and solelysupporting the fore end of the trigger ro d , thus stopping itsmovement downwards, whereby the percussion arm is locked inthe cocked position . The forward pointing arm of the trigger ,which is somewhat shorter, is free , so that the recoil arm canbe released and the gun can be unloaded without risk of firing.

In position "S" (safety) the cam slopes upwards and backwards, thus supporting both trigger rod and trigger and lockingthem, so that firing is impossible.

6. The breech block and its movements.(Figs. 4, 5, 6 and 7 ).Forward on the right side the breech block (59) has a down

ward lug having on its right side the breech block guide stud(59 A) . At the top rear the breech block is drilled transversallyfor the breech block bolt (61) : it is also drilled longitudinallyfor the firing pin (62) ; on its underside is the ejection track(59 B) , and on its upper side is a clearance to permit the cartridge to be fed into the chamber.

The breech block guide plate (20) is placed in the right sideof the frame (1) and on its inner side has five blocks whichserve to guide the motion of the breech block as describedbelow.


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10On Fig. 4 the barrel ( 43 ) is shown closed by the breech block

(59) . Th e breech block guide stud (59 A) rests between thetwo foremost blocks of the breech block guide plate (20 ), thesetwo blocks forming a horizontal track for the stud. When theshot is fired the parts begin to recoil , in which motion thebarrel and the breech block retain their mutual positions, so thatthe chamber is still closed until the guide stud strikes against themiddle block on the guide plate. As the breech block is restingon the ejector (54 ), the guide stud cannot slip under the middleblock so that it now moves up along the track a-b, thus raisingthe fore end of the breech block so that the chamber is opened.

As the recoil continues , the guide stud runs along the trackb-e, which keeps the breech block raised up so that the emptycartridge case can be ejected.

When the guide stud has passed the point c. the breech blockspring (60 ) in the lid (2 ) of the frame will press down the foreend of the breech block ; and as the recoil is simultaneouslyended and the return movement begins, the guide stud will glidedownwards and forwards along the track c-d , so that the chamberis open while the guide stud runs forward along the track d-e.During this latter motion a cartridge is fed into the chamber;the latter is then closed by the breech block, of which the guidestud runs up along the track e-a and continues till it reaches itsstarting point between the two foremost blocks of the guide plate.

Of the two rear blocks on the guide plate, the purpose of theupper one is to facilitate the ejection of unfired rounds , whereasthe lower one prevents double loading.

7. The cartridge feeding mechanism.(Figs. 5 and 7).

On the left side of the frame ( 1) is the magazine receiver(A) , into which a magazine can be placed and locked there bythe magazine catch ( 12) ; the rounds from the magazine fall on

11to the floor of the magazine receiver, the magazine cut-off beingpushed back by the action of inserting the magazine.

Th e cartridge distributor ( 173) forms the floor and left wallof the magazine receiver and turns on its own axis on the cartridge distributor pin ( 177 ), which lies parallel to the axis of thebore.

Th e cartridge distributor, which in this manner forms a bedfor the cartridge, has on its left side an outward cam and on itsright side a short arm (C ) , which is actuated by the distributorguide ( 163) on the left side of the breech, against which the armis pressed by the cartridge distributor spring ( 174).

Th e cartridge feeder (51 ), which turns on the cartridge feederaxle pin (52) between two downward lugs on the breech ( 44),is in the form of a three-armed lever, with one long arm andtwo short ones, and it can move backwards and forwards between the breech block and the left wall of the breech , whichhas an elongated clearance for the passage of the cartridge.

The long upward arm of the cartridge feeder deals with thecartridge, whereas the two short downward arms govern themotions of the feeder by engaging round the cartridge feederactuating block (66) on the trigger plate (65 ) .

At the moment of firing the cartridge feeder (51) is right forward and rests lightly against the extreme left edge of the cartridge base, whilst the cartridge distributor ( 173) , of which thearm (C ) rests on the upper edge of the distributor guide ( 163),is turned outwards so that the next round is lying on the floorof the magazine receiver.

With the firing of the round the barrel and breech recoil ;with this the arm of the cartridge distributor glides down theramp of the distributor guide, thus releasing the distributorspring and pressing the round in the magazine receiver over towards the left side of the breech, while the outer cam of thedistributor passes under and cuts off the next round.


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12At the same time the cartridge feeder actuating block (66)

swings back the cartridge feeder (51) , so that it has just passedand stopped behind the rear edge of the cartridge opening inthe left side of the breech shortly before the same rear edgepasses the base of the cartridge in the magazine receiver.

Now the cartridge distributor presses the cartridge (B ) inthrough the opening into the breech block in front of thecartridge feeder, with the point of the bullet turned a little tothe right , whereafter, when the recoiling parts begin their returnmotion and the breech block falls to its lower position , the'cartridge feeder moves forward and takes the cartridge throughthe clearance in the upper part of the breech block and into thechamber , which is then closed by the breech block ; the distributorguide ( 163) meanwhile has again turned the cartridge distributorback, so that a fresh round falls down into the magazine receiver.

8. The ejection mechanism.(Figs. 6 and 7).

The ejection mechanism consists of the ejector (54 ) , theejector lever (56) and ejector lever spring (58) , which havetheir position in the forward part of the breech ( 44) and theejector trip block ( 18 ) . which is held by a nut to the bottom ofthe frame ( 1) .

The ej ector , of which the hole for the ejector bolt (55) issomewhat longer and wider than the bolr diameter, has a certainamount of play and is kept in the vertical position by the ejectorlever, which is kept pressed down by the ejector lever springand with its claw engages the slot in the bottom forward edge ofthe ejector. When in this position the extractor on the ejectordoes not reach as far as in behind the collar of the cartridge inthe chamber.

During the rearward motion produced by the recoil, the foreend of the breech block is raised as already described, while the

13ejector, still vertical, glides up the ramp of the ejector trip block.This upward motion takes the extractor in under the collar ofthe cartridge.

During the passage of the ejector across the horizontal sur-face of the ejector trip block the claw of the ejector lever is liftedfree of the slot, as a stud on the left side of the lever glides up asloping track on the left side of the ejector trip block.

After passing the horizontal surface of the ejector trip blockthe ejector trips against the step on the block, falls backwardsalmost to a horizontal position and throws out the empty case ;the case follows the ejection track (59 B) of the breech block andfalls down through the opening in the trigger plate, where itstrikes and is deflected by the deflector (92), so that the casehits neither the gunner nor his helper.

Fig. 6 shows the mutual positions of the parts described whilethe recoil is in progress, at the moment when the ejector (54)is tripping over the step on the ejector trip block ( 18).

When the recoiling parts are moving forward , the breechblock (59) , which is now in its lowest position, will hold theejector (which after ejecting the empty case is lying on theejector trip block.) down in its prone position until the breechblock guide stud has passed the sloping track of the forwardlower block, whereafter the ejector lever , which has become re-engaged with the ejector, will raise the latter to its vertical posi-tion again, partly under the influence of the ejector lever spring(58). partly because the aforesaid stud on the left side of theejector lever is pressed down by a bevel flange at the fore end ofthe left side of the ejector rrip block.

9. The firing mechanism.(Fig. 7).

The firing mechanism comprises the firing pin (62) and firingpin spring (63) and the hammer (48).


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14Th e firing pin which has its position inside the firing-pin way

in the breech block (59 ), has a rounded point at the fore end ,at the middle a shoulder for the firing pin spring , and at therear a cylindrical collar, the fore edge of which , in conjunctionwith a seating in the firing-pin way , limits the forward motionof the pin, whilst the rear end forms an anvil for the headof the hammer. In the und erside of the firing pin collar is a slotfor the firing pin retaining stud (64 ), which restricts the rear-ward motion of the firing pin.

Th e firing pin spring (63) , which lies round the firing pinand is compressed between the shoulder of the pin and a cylindrical seating in the firing-pin way , keeps the point of the pinbehind the front face of the breech block except at the momentof firing.

Th e hammer (48) , which swings on the hammer axle pin( 49) in the rear wall of the breech ( 44) , has a head at the frontfor the firing pin and at the rear an anvil for the percussionarm (70 ) .

When the trigger releases the percussion arm , it strikes downon the hammer , which transmits the stroke to the firing pin,whereby the latter is thrust forward and hits the percussion capof the cartridge, the firing pin spring being compressed at thesame time.

At the very beginning of the recoil after the round is fired thepercussion arm leaves the anvil on the hammer , gliding up aninclined track in the link (47) , so that the firing pin spring canwithdraw the tip of the firing pin into the breech block.

10. The magazine.(Plate VII) .

The magazine is in the form of a flat box of sheet steel.One end of the magazine is closed by the bottom, whereas theother is open . Inside the magazine is the platform; between

. .

ISthe latter and the bottom is a spring, which gradually becomescompressed as the magazine is being filled with cartridges.

The cartridges are prevented from falling out of the magazineby an outside spring with a hook on its left side; this is automatically released when the magazine is placed in the magazinereceiver on the gun.

The reinforcing band at the open end of the magazine has alug at the front and a clearance at the rear to secure the magazine in the receiver, which has a corresponding clearance andthe magazine catch.


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II.ACTION OF MECHANISM WHEN

FIRINGThe gun is designed for automatic fire , and therefore auto-matic fire is the normal, employed in long or short bursts of up

to a whole magazine at a time.Single shots can be fired if the gunner lets the trigger go

quickly after each round ; the mechanism will then remain in therear position each time, as explained below.

The gun must be loaded before firing commences.Loading.

When a magazine is placed into the magazine receiver , thespring hook will be pressed to the left so that the cartridgesbecome free ; they are then pressed forward by the magazinespring until the first round is lying on the floor of the magazinereceiver.

Th e gunner then performs a loading motion, in which thecrank is pulled smartly backwards, then released and , with ablow of the hand, thrust forward till it engages with the crankcatch on the right side of the frame .

This motion rotates the crank axle bolt, and with it the recoilarm , which draws the recoiling parts back to the rearmost position, where they are held by the nose of the trigger enteringup behind the notch on the recoil arm.

At the same time the percussion arm is cocked, being heldby the nose of the trigger rod , whilst the cartridge distributor

17has carried the first round from the magazine receiver over to-wards the left side of the breech block in front of the cartridgefeeder.

Th e gun is now ready to fire ; if necessary the safety catchcan now be applied.

Firing.The gun is fired by pressing the trigger. This p r ~ s s u r e lower.s

the forward-pointing arm of the trigger, thus releasmg the. reco1arm . under the pressure of the recoil spring the arm carnes therecolling parts forward, whereby the cartridge is inserted intothe chamber and the breech block closes it as described above.

When the recoiling parts still have about 2. 5 mm to completethe forward motion, the tri gger stud (69 A) on the recoil armhits the trigger rod and depresses it, thereby releasing the per-cussion arm to fire the round , while the next cartridge falls intothe magazine receiver as previously described .

Th e recoil is produced by the pressure of the powder gasagainst the inside of the cartridge base .

During this motion the empty case is ejected after the breechblock is raised under the influence of the guide stud as statedabove.

Before the breech block rises , the firing pin must be drawnback from the percussion cap and the pressure must have leftthe barrel. For this reason the rearward movement of the breechblock is straight backwards for the first 10 mm , and during thismotion the link raises the head of the percussion arm awayfrom the hammer, so that the firing pin can be pressed back bythe firing pin spring. For this purpose the link has an inclinedtrack which presses against the right half of the head on thepercussion arm .Furthermore, the cartridge feeder is turned back and the nextround is laid over in front of it by the distributor.


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18Simultaneously , the recoil arm and percussion arm are

pressed back by the breech link, thus compressing the recoil andpercussion springs; the nose of the trigger rod engages in thenotch in the percussion arm, which is thus cocked.

Th e recoil having ended , the recoil spring thrusts themechanism forward , and the next round is fired just beforethe forward movement has terminated ; firing proceeds in thismanner till the magazine is empty or till the gunner ceases topress the trigger.

If the magazine is empty, the mechanism will stop in the forward position, with no round in the chamber.

Should the gunner release the trigger before the magazine isempty, the trigger spring will force the forward-pointing arm ofthe trigger upwards and irs nose will enter the notch in therecoil arm the first time the latter passes the nose on its wayback ; this prevents the mechanism from moving forward again ,and no round is fed into the chamber.

It will rhus be seen that by means of this device no cartridgewill be placed in the chamber when fire ceases, and it is there-fore impossible for a round to enter a heated chamber and per-haps explode through spontaneous ignition.

As stated above, the gun can fire a single shot at a time byreleasing the trigger quickly after each round. The gun will thenact as described above for every round. If the gunner is notquick enough in releasing the trigger, two rounds automatic willbe fired before the gun stops.

Unloading.If firing ceases while there are still rounds in the magazine,

and firing is nor to be resumed , the gun is unloaded in thefollowing manner.

The safety catch must be turned to "D " (Discharge) and themagazine lifted off the magazine receiver , being gripped from

19the rear with the right hand which presses it forward and downwards , the magazine catch at the same time being released by apressure forward with the palm of the hand.

There will now be two rounds at most in the magazine receiver, and they can be removed by alternately pressing thetrigger and performing a loading motion .

These rounds can also be taken out of the magazine receiverby pressing the forefinger on the nose of the bullet, thus tiltingup the base , or by turning the gun on its left side and shakingthem out. Th e lower cartridge must in this case be set free bypressing the finger-piece of the cartridge distributor with the lefthand .After unloading, the mechanism is returned to the forwardposition and the deflector closed up.


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III.STOPPAGES AND THEIR REMEDIES

Should the gun stop while firing , the gunner must apply thesafety catch at once if possible, then quickly open the frame lidin order to judge of the cause from the position of the mechanism.

While clearing the trouble the gunner must keep calm, usehis head. and act energetically but without ever using force.

Th e following stoppages may occur :1. jams.

A Jam can be seen from the fact that the mechanism is not allthe way forward and that the breech block has stopped in itslower position, being prevented from rising by a round whichhas not been fully inserted into the chamber.

Cause:a. The cartridge cannot go right into the chamber owing to

dirt on it or in the chamber itself, or dents in the cartridgecase.

b. The empty case of the last round has separated , and theend is jammed inside the chamber.

Remedy :a. I. Close the lid and cool the barrel by pouring water on it

from the water-bag. Then make a few very short loading motionsto try and press the round right into the chamber, whereafter itis extracted by making a powerful loading motion.

/'

21a. I I. If the round cannot be made to go right into the

chamber remove the magazine and any rounds in the magazinereceiver. Now draw the recoiling parts as far back as possible,pulling the crank with the right hand , the left hand armed withthe emergency extractor (253) easing the jammed cartridge outof the chamber and pressing it so far over against the cartridgedistributor that the recoiling parts can pass into their forwardposition. Then pick up the cartridge from the magazine receiverwith the extractor.

b. Close the frame lid remove the magazine and any roundsin the magazine receiver.

Now turn the trigger plate down and change the barrel; theloader then extracts the separated case from the barrel withthe clearing plug (267). Th e clearing plug cannot be insertedinto the chamber while the barrel is in the gun.

2. Faulty closing.This is recognized by the mechanism being right forward , the

round right home in the chamber, and the breech block on theway upwards .

Cause:Th e cartridge collar is too thick or the cartridge itself too

long.Remedy:Close the frame lid, cool the barrel with water, then proceed

as fo r jams a. I. and a. II.

3. Faulty ejection.Th e mechanism is not right forward and the breech block isin its top position.


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22Cause:a. The cartridge case has jammed in the chamber and the

ejector has torn the cartridge collar .b. The cartridge case has merely got jammed in the chamber.Remedy :a. Pull back the recoiling parts , then push out the case with

the cleaning rod.b. Eject the case by making a loading motion .

4. Misfire.The mechanism is right forward and the percussion arm has

fallen , but there is a round in the chamber.Cau se:Faulty percussion cap or charge.Remedy:Close the lid and eject the round by a quick loading motion.

5. Faulty cartridge feeding.a. The mechanism is not right forward, the breech block isin its lower position , the round is not fully inserted, the cartridgefeeder is lying alongside of or behind the cartridge, and the per-cussion arm is cocked.

b. The mechanism is right forward but the chamber is empty.Cause:a. The round fell too late from the magazine for the cartridge

distributor to have time for laying it over in front of the cart-ridge feeder, either owing to dirt in the magazine or because themagazine spring is too weak or it is broken.

Otherwise , the cartridge distributor spring may be weak orbroken, or the cotter in the distributor pin has fallen out.

23b. short recoil, owing to low charge in the cartridge , or the

mechanism is too dry or dirty.Th e rounds may have stuck in the magazine owing to dirt ,

dents in the cases or in the magazine, or the magazine spring isweak or broken.

Remedy:a. and b. Perform a loading motion. If this does not suffice,remove the magazine and the rounds from the magazine re-ceiver ; then take out the round that failed to enter the chamberand inspect both magazine and cartridge distributor , etc ., cleanand oil. If necessary, clean and oil the mechanism.

Should the magazine be defective, take another one ; if thecartridge distributor spring is weak or broken , replace it.

If the cartridge distributor pin cotter is missing, replace it.

6. Empty case in ejection way.The case is extracted from the chamber but is jammed be-

tween the recoiling and the fixed parts of the gun.Remedy:Open the frame lid and perform a short loading motion , which

will cause the case to drop out.


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697 0

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..",.,,.l

V.NOMENCLATURE AND

PHOTOGRAPHSOF

PARTS, ACCESSORIES AN D TOOLSFOR

THE MADSE J MACHI E GU NMODEL 1940

MAIN PARTSI. BARREL CASING

Barrel casing.Sights.Flash absorber.

II. FRAMEFrame.Frame lid.Sundry parts of frame and

lid.III. BARREL

Barrel.Breech.Breech block.

IV. TRIGGER PLATETrigger plate.Trigger guard.Safety catch .

V. STOCKStock.Stock elevator socket .Periscope sight base.Struts.Fittings.

VI. STOCK ELEVATOR

VII. MAGAZINE

VIII. ANTI-AIRCRAFT SIGHTFore sight.Rear sight

IX. ACCESSORIES AND TOOLS

X. ACCESSORIES AND TOOLS


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Ph oroNo.

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Name o f Part

I. BARREL CASING

FactorvNo.

Barrel casing . .. .. .. .. .. . . .. .. .. . . .. .. I 04

Sights.ForesightFores ight protector , right .. . . . . . . . . .. ....... . ... .Foresight protector left . ............ . .......... ..Foresight protector screw for 110 and 111 .. .Pin for No . 33 ........... .. ..................... ..Rear sight base .. ... .... . .... ..... .. . . ............ ..Rear sight base rivet . . . . . . . . . . . .. .... . . . . . . . . . .Rear sight leaf spring .. . . . . . . . . . .. . .. . .. . .... .... .Rear sight leaf .. ..................... .. ........... ..Rear sight hinge screw ....... .... . .. . .. . . . .. .. .Rear sight slide . .. . ...................... . . . ....... .Rear sight slide catch .. ................. . . . ...... .Rear sight slide catch spring .. .. .. .. . ... .. ..... .

Fla sh absorber.Flash absorber . .Flash absorber catch ... .. ... . .... .. . . .... ........ .Flash absorber catch spring .. .. .... .. ..... .. . .. .

31110I l l33342330262425272829

381236238

. .

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Na me of Parr

II . FRAMEFram e .... ... ....... ... ..Fram e lid

Sundries tor Frame and Frame Lid.Frame lid hinge pin .. ... . . . . . . . . . . . . . . . . .... . .Pin for No. 3 . . ...... . ..... ........ .. . . ... .. .... . . . .Frame lid hinge spring .... ...... .. ...... .. . . . . . .Breech block spring .. . . .. . . . .. .. .. . . .. . .. . ...... .

Frame lid locking bolt . .... . .. . .. . . .. . . . . ... .. . .. .Frame lid locking bolt pawl ... ... .. . .. .. . . . . .. .Frame lid locking bolt pawl springFrame lid locking bolt pawl pin

Magazine catchMagazine catch pawl . ........ . . .. .. ...... . .. . ..... .Magazine catch spring . .. . .. . . ....... ... . . .. . . ... .Magazine catch pin .. .. .

FactoryNo.

2

334

2S460

22401402403

121413IS

32 Cartridge distributor . . . . . . . . . . . . . . . . . . . . 17333 Cartridge distributor spring . . . . . . . . . . . . . . 174

.

PhotO'o.

343S

3637

38394041

4243444S

Na me of Part FactarvNo.

Cartridge distributor pin . . .. . . .. . .. . . . . . . .. 177Pin for No. 177 . .. . .. . .. .. .. .. .. . . . .. . . .. .. . .. . 34Breech block guide plate ... . ...... . .... .. ... ... ..Breech block guide plate latchCrank catch stop

2021

lSI

Frame end plate .. .. . .. .. .. . . . . . . . . . . . .. . . . . . 16Frame end plate screw .. .. . .. .. . . . . .. . . . .. .. .. . 17Frame bottom plate . . . .. .. .. .. .. . . . .. . .. .. .. .. .. . ISO

Ejector trip block . .. .. . . . . . . . . . . . . . . . . . . .. .. . 18Ejector trip block nut . .. . .. .. .. .. . .. . .. . .. .. .. . . 19Frame bottom bolt . .. .. .. .. .. .. .. .. .. .. . . .. . . 141Frame bottom bolt locking pin . .. . .. .. . . . . . 902


22/42

Facto rv0 .

17734

2021

lSI1617

ISO1819

141902

j -

20

r 21.12

.19

t26-

-901

18

23~~

"''

2-f...I.J-1

19

282! 2'1 ~. ymm

.J6JS

2 '

.J?~

45I

..

Jo .11

.18


23/42

PharoNo. Name o r Part

III. BARRELBarrel.

:. -:; 46 Barrel' . . . . . . . . .... . ... ...... . . .. .... . ............. ' 47 Barrel locking pin

48 Pin for No. 162 ,'.. Breech.49 Breech . . . . . . . . . . ... . .... . .. .. .. . ... ..... . . 50 Distributor guide .. ............. .. ....... . ........51 Distributor guide rivet ... . ... ........ ...... ... ..!52 Ejector . . . . . . . ... ....... . .. ... . ......... .... .... - 53 Ejector bolt - - - -54 Ejector lever - - --55 Ejector lever axle pin .. ... . .. . .. ...... . ... . . .. . ...56 Ejector lever

spr ing .... . I, 57 Ejector stop.. . 58 Ejector stop p1n ... .. . .... ... ..... ..... ...... .. .. ...

59 Pin for No. 45 ... - 60 Cartridge feeder - 61 Cartridge feeder axle pin -62 Ke y for No . 52 .... . . ..... .. ..... .. ........ ... . . . .. .63 Pin for No. 52 -- -

Fa c1oryNo.

4316234

441632885455565758464S345152

21953

f

Pha roNo.

64656667

6869707172

Name of Parr

Link ......... .... ...... ............... ... ... .......... .Hammer ....................... ..... .. . . .. . ... ...... .Hammer axle pin ..... .. . .... ...... .. .... . . ...... ..Breech cover plate . ... ........... . ..... ..... .... .. .

Breech block.Breech block .. .. ... . .......... .. ....... .. ... ... .... .Breech block bolt .. .......... ....... ........ ... .. ..Firing pin ... ..... ..... .. . .... .. . .. ............. .... ..Firing pin spring .. ......... ..... ............... ... .Firing pin reta ini ng stud . .. ...... . .... .... .. .. . .

Fnc1oryNo.

474849

298

5961626364


24/42

Facto ryNo.

-16 47. ..... . . ... 48 49 298

"' 9 .fo .J"/59 ~ I

. ....... .. . 61. . . . . . 62....... .. . 63 64

{,/J8 59 II7 I---

(, 9--

52e 5J 5, .1f-- . TJ"'4 t. f6! 'Jq ) .A

'll

..,,

II

55J

,,II

72_ l

-ItS

.f'r . ' ' t ' o ' t \ ' , ' ~

6'7r-.__


25/42

Photo0.

737475767778798081828384858687888990919293

Name o f Pa rt

IV. TRIGGER PLATE

FactoryNo.

Trigger plate . . . . . 65Cartridge feeder actuating block . . . . . . . . . . . 66Cartridge feeder actuating block rivet . . . . . . . 396Trigger plate bolt . . . . . . . . . . . . . . . . . . . . . . . . 164Recoil arm stop . . . . . . . . . . . . . . . . . . . . . . . 165Recoil arm stop riv etPercussion arm stopPercussion arm stop rivet .. ........ . . ... . . .. . ... .Percussion arm stop rivet . ... . . ........ .. . . . . . .. .Crank stop pawl . . . . . . . . . . . . . . .. .. . .. .. . .. ........ .Crank stop pawl rivet .... ....... . . .. .. . . . . .... . . .

T e l e s c o p - s ~ g h t post ....... .. . . . . . . . ...... . .. . . .1Telescope-s1ght post n vet ...... . . .. ........ .... .Telescope-sight post rivet .... . ... . . .. . .... .... .. .

221

406407408395221-A755221-A883

Crank ...... .. . .. .. ... . . .. . . . ..................... ..... 67Crank bolt . . . . . . . . . . . . . . . . . . . . . . . . . . . . 167Crank knob . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 166Crank bolt washer . . . . . . . . . . . . . . . . . . . . . 168Crank axle bolt . . . . . . . . . . . . . . . . . . . . . . . . 68Crank block washer . . . . . . . . . . . . . . . . . . 71Crank bolt pin . . . . . . . . . . .. . . . . . . . . . . . . . . 73

,,PhotoNo.

949596979899100

101102103104105106107108109110Il l11211311 4

Name of Par t

Recoil arm ... . .. ..... ... ..... ..... .. . . . .... . ... .... .Recoil spring plunger .. .. . . .............. . . . ... ..Recoil spring . .... . .... .. ..... . ... . . . . .............. .Percussion arm . . . ..... .. . . . . ..... ..... . . .. .. . . .. .. .Percussion spring plunger . . . . . . . . . .... . .. ..... .Percussion spring . ... ... .. . ..... .. .. ..... . ...... ..Percussion and recoil spring bas e ............ .

Trigge r guard.Deflector hinge pin .............................. . .Key for No. 93 ....... .. ....... . .. .. .. ... . ........ .Pin for No . 93 .. .. ..... . ... .. ... . .. ... .. .... . ..... .Trigger guard ... ... . .. ................... . . ........ .Trigger . . . .. .... .. ... .. . .. .. .. .. .. .. . .............. .. .Trigger spring .. .... . .. ... . . . . . . . .. . .... ... . .. .... . .Trigger rod . . . . . . ......... . . . .. . . . . . .. . .. . .. ........ .

Fac toryNo.

697475

70777678

932 19-A2 15

79808185

Trigger rod spring . . . . . . . . . . . . . . . . . . . . . 81Trigger rod pin . . . . . . . . . . . . . . . . . . . . . . . . . . . 87Pin for No. 87 .. . . . . . . . 34Deflector . . . . . . . . . . . . . . . . . . . . . . . . . 92Deflector opening spring . . . . . . . . . . . . . . . . . . 169Deflector latch . . . . . . . . . . . . . . . . . . . . . . . 94Deflector latch scr ew . . . . . . . . . . . . . . . . . . . . 95


26/42

PhotoNo.

115116117118119120

Name of Part

Safety Device .

FucwryNo .

Safety catch . . . .. . . . . . . . . . . . . . . . . . . . . . . 91Safety catch pawl . . ... .. .. .. .. . .. . . .. .. .. . . .. .. 409Safety catch pin .. .. .. . . . . . . . . .. . . . .. .. .. .. .. . 41 1Safety catch spring .. .. .. . . .. .. . .. .. .. .. .. . .. . . . 410Safety catch spring housing .. .. .. .. .. .. .. .. .. .. . 895Safety catch washer . . .. .. .. .. .. .. . .. .. .. .. .. .. . . 896

12 1 Safety catch pin ........ .. ...... .. ...... ... .. ...... 411-A

,.

- ..


27/42

1

F t ~ c l ONo.

91409411410895896411-A

91

1IOO;I

't !JJ0 ~

10 /I /0 2 /o.J-II / 112---

,,. 96 '7?'15 '18 7'I I g r g'

!J f 3{.lf,fffl,MHffHtf9f1

lo"- lo S~ ~ )liS

II J"" lil

17

8.1 l-9 8 f 48 8,40 81 82 I lT TJ, l I 909 1 I!J'l

!14 ,,iftfiillittlh!#.ltUti#IUUPI

lo ' IO? lo8 /0 ?~ lf 1/0'I I ' 117 1/8 1/'.J 12o 121 0 I


28/42

Phoroo.

122123124

12S126127128

129130131132133

13413413S136137

Name of Pan

V. STOCKStock.Stock ... . .. . .. . .. . . .. . ..... .... .. .... .. . . . .. .. .. .. ... .Stock screw . . . . . . . . ... . ........ . .... . .. .. . . ... . .Shoulder flap hinge plate screw ... . ..... . .. . . .Stock elevator socket.Stock elevator socket .... . ... . ................... .Stock elevator clamp ...... . . . . . . . . . ... .. . . ... . . . .Stock elevator clamp wing-nut . . ............... .Srock elevator clamp wing-nut washer . .. . . .Periscope sight base.Periscope sight basePeriscope sight base screw . . . ..... . . . ..... . .. .. .Locking pawl for No. 936 .... ........ ... .. .. ..Spring for No. 936 ... . .. . ... . . .... . .. ... . . ... ... . IPin for No. 936 ....... .. .. . . . ...... ... . . . ... ...... .Strut.Strut hinge collar .. . . . ............ ... .. . ....... . . .. .Stop pin for strut hinge collar .... ... . .. . . .. .. .Strut hinge collar clamp .. ..... . ...... . . ...... ... .Strut hinge collar screw .. .... . .... . . . . . . . . . . . . . .Pin for strut hinge collar screw .. .. ..... . . . .. .

1

Factoryo.

9698102

197198199-A277-A

936102937938939

3892317S3721S

PhoroNo .

13813914014014014114214314414S14S146147148149ISOlSIIS2IS3IS4

ISSIS6

Name o f Parr FactoryNo

Strut head .. . . . . . . . . . . . . . . . . . . . . . . .. . . . . . . 179Strut assembling pin .. . . . . ...... . .. . .. . .. . . . .. .. .Strut tube .. .... . .. .. . . . . . . . . . . . . ... . ... . ....... . .. .. .Strut tube collar .... . . . . .. .. .... ......... . . . .. . ... . .Strut tube collar pin .. ... . . . . ......... ... .. ....... .Strut stay-bar band .. . .. . . . . . . . . . . . .. .. .......... . .Strut transverse stay-barStrut transverse stay-bar . .... . .... .. ......... .. . .Strut stay-bar band pin ... . . ... . . . ..... .. .... .. .. .Strut stay-bar screw .......................... .. .. .Strut stay-bar screw key . . . .. .. ... . . ........ ... . .Strut stay-bar screw washer .... .. . ....... . ... . . .Strut stay-bar wing nut . . . . . . . . . . . ....... . . . .... . .Strut stay-bar screw washer .......... . . .. . ... . . .Strut tube collar .... .. ............. . . . . . . . . . . . . . . . . .Strut tube collar pin . ..... . .. . . . . . . . . . . . . . ..... ... .Strut spike . .. . .................. . ......... . ..... . ... .Strut assembling pin . .. ...... . ..... . ..... .. .... . .. .Strut spike flange . ... . .. . . . .. .. . .. . ...... . . . .... . . .Strut spike flange pin

Fittings.Carrying-handle ring . . . . . . . . . . . . . . . . . . . . . . . . . . . .. .Carrying-handle ring screw ....... . . . ........ . . I

I

IS840

789749784747747-A78678S190787199277790749IS6IS83S36

S98128


29/42

PhotoNo.

157158159160161162163164164165166

Name of Part

Sling-swivel ring nut .............................Carrying-handle arm pin . .... ..... .. .. . ..... .. .. .Carrying-handle arm ........ .. . ...... . ... . . . ..... .Carrying-handle ..... ... ........ . .. . ............. . .Carrying-handle arm washer ... . . . . . . . . . . . ..... .Sling-swivel ring .. .... . .. ..... . ...... . ...... ... ... .Sling-swivel ring screw .. ...... . .. . . . . . . . . . .. . ... .Sling-swivel ................. .......... . ...... . . . .... .Sling-swivel eye . . .... . ... . ... . ...... . ........ . .. .. .Sling-swivel ring link .. ............ . . . . . . . . . . . . . . .Sling-swivel ring link pin ..... . . . . . . . . .... ..... ..

FactoryNo.

943597595592168126128127155112113


30/42

.. r

12!Facrory

No. 12,

I 12-1 643 l 127 124597 I.. ... 0595592168

12 , IJO IJ I 112 I] Jl .....0....... ff126128127 1) 9 IJ S 1 ] ,155 ~ n 1

IJ I /.1,II112

113 1.37

#I 1-lj"b 1-12 I.,.J 14-1 T 14 , 14 7 1-18 / - I ~ ISO lSI 152 ISJ 151c c ) II 0 Lu-) 0 0 ~ II IIl.f'.f IS86 IS7 IH

1'2 /,.,1 I ) I

,,, Q ,,J 0 IM0 I 0 6'


31/42

PhotoNo.

167168169170171172173

Name o f Part

VI. STOCK ELEVATORStock elevator spindle tube . . . .... .. . . .... .. ... . .Stock elevator sleeve nut . . . ....... . . . . . ... . ..... .Stock elevator stop screw .... . . .. ....... .. .. . ... .Stock el evator spindl e . .... ..... . . . .. . . .. .. . .. ... .Sto ck elevator foot . ... ..... ........ . . . . . . . . . . . . . . . .Stock elevator foot locking nut .. . . . . .. ..... .. .IStock elevator foot screw .. . . ..... .. . . . . . . . . . . . . .

.

FacroryNo.

194193275195196274273

r


32/42

1&7

171

/'70 1'72 17.1I t \ ; . ; : i ; ; ~ : . V ; f s 5 WWfoESs; s 1 ee 0


33/42

'[:,.

., .

Ph o10No. 'arne of Pan

Vll. MAGAZINE

FacrorvNo.

174 Magazine . . . . . . . . . . . . . . . . . . . . . . . . . . . 5000174 Magazine lid ... ..... . ... .. . . . ... .. . ... .. . . ... .... . . 5001175176177178

Magazine reinforcing band . . . . . . .. . ..... . .. .Magazine bottom band ... . .. . . .. . .. .. .. ... . ..... . .Magazine cut-off . . . . . .. . . ....... .. . . . . . . . . . . . . . . . . .Magazine latch spring . . ... . ...... .. .. ........ . ... .

5010500250065011

179 Magazine platform . . . . . . . . . . . . . . . . . . . . . 5005180 Magazine platform spring . . . . . . . .. . . . . 5008181 Magazine platform box . . . . . . . . . . . . . . . . . . 5003182 Magazine spring . . . . . . . . . . . . . . . . . . . . . . . . 5007183 Magazine base plate . . . . .. . . . . . . . . . . . . . . .. 5009


34/42

. :-:.,

..

:


35/42

/

VI.DIMENSIONS, WEIGHTS, ETC.

OFMADSEN MACHINE GUN

MODEL 1940*

Length of gun with flash absorber . ..... . ... . .... . 1600 mmWeight of gun with flash absorber .. .... ... ... .. .. 9.0 kgLength of spare barrel with breech ....... . ... .. . . 640 mmWeight of spare barrel with breech .............. . 2 .2 kgLength of r ifled part of barrel .. .. . ..... .......... . 412 .19 mmNumber of grooves .............. . .. .... . . . . . . . . . . . . . .. 4W idth of grooves ... ............... .. ............ .. .. .. 3. 9 + 0 .2 mmDepth of grooves ......... . . ............. . . . . . . . . . . . . . 0.12 + 0.06mmPitch of rifling ( right-hand turn ) ...... .... ... .... . 240 mmCalibre .. .. .. . . .. ...... . ..... . . ..... . ... .......... . ...... . 7.94 + 0.03 mmRate of fire .......... .. .... .. . . ...... . .. ... .. .. .. . .. . . .. 450 r. p. min .Maximum range . . .. . .. . . . .. .. . ... ....... . .. ...... .. . . 2900 mMaximum range on sights .... .. . . . . . . . . . . . . . . . . . . . . 1900 mMuzzle height, gun on struts .. .. .. .. . . . . . . . . . . . . . .. 330 mmMagazine weight (empty) .... .... ................. .. 0.540 kgMagazin e weight (with 30 rounds) ....... . .... .. 1.338 kgWeight of cartridge ... . .. . .. . . . . . . . . . . . . . . .. . ....... .. . 26.6 gLength of cartridge . . . . . . . . . .. .. ...... ... .. .... .. .. .. . 75 .1- 1 mmWeight of bullet ........... .. .. . . ....... .. .... ........ . 11.7 gMuzzle velocity at 30 C . .......... .. .... .... .. .... . 725 m/sec.

irI

..,#i


36/42

?howNo.

197198199200201202203204205206207208209

Name of Parr

X. ACCESSORIES AND TOOLS

Spring remover ... . . . .. . . . . . .. .. ........ . .. . ...... .Hexagon spanner .. . . .. ...... . ..... ... ..... . .. ... . .Pair of nippers . ...... . ... . .. . ... .. ...... .. . ...... .Barrel mirror ... . .. . . . .... .. .... ..... .. . .... . ...... .Punch , 3 mm ... ... . . . . . . . . .. ......... .. ........... .Punch, 4 mm .. . .. ........... ... . ..... ..... ........ .Wires, bundle of .. . . . . . . . . . . . . . . . . . . . . . . .. .. .. .. .Wires, bundle of ....... . ...... .... .. . .... ...... . .Hammer screwdriver .. .............. . ... ...... ..Box .................. . . ... . . ........ .... ..... . .. . . .. .Deflector key . . . .. . ... ... . .... . ......... ..... ..... .Brass punch .. ...... .. .. .. ... . ...... .. ............. .Breech key ... .. . ... .... . .. . ..... . . . ......... . ...... .

1

FacwnNo.

13613814214527014622422526429339i147263


37/42

197

2oo241 2o2

2o'J 2o8 209


38/42

PhotoNo . Name of Pan

IX. ACCESSORIES AND TOOLS

FactOrYNo

190 Cleaning rod . . . . . . . . . . . . . . . . . . . . . . . 134191 Chamber pull-through . . . . . . . . . . . . . . . . 135192 Oil can .. ...... . .. . ...... ..... . .... . .. ... ...... . . . .. . 143193 Oil can cap and brush . . . . . . . . . . . . . . . . . . . 217194 Cleaning rod extension . . . . . . . . . . . . . . . .. . . . 205195 Extractor, emergency .. ................ . .......... 253196 Clearing plug and hook key ..... . . . . ... , .... . . . . 267/251

,.r


39/42

/ ~ ( )

193ijj

...


40/42

Pho10No.

184185186187188189

Name of Part

VIll. ANTI AIRCRAFT SIGHTFore sight .. ... . ......... . . . ...... . ..... . ............ .Fore sight claw pin .... .. .. .. . ..... . .. ............ .Fore sight claw ... ... . .. . .. . .. . . ...... . .. . ........ .Fore sight claw screwRear sight post .. .. .. .Rear sight post screw

FacroryNo4

4321554578-A579440579


41/42

184

18$ 119~

.. .:

..

;..,. .


42/42

I23121314IS16171819202122232425262728293031333434

KEY TO NOMENCLATUREFrame .. ... . .. ... . .. . ... . . . . . . . . . . . . . . . . . . . . . . .Frame lid ... ..... . .. .. .. . . . ... .. . ... . .... . ....IFrame lid hinge pin .. . .. . . .. ...... ....... . .1Magazine catch ............... . .. ........ . .. .Magazine catch spring .................... .Magazine catch pawl .. . . . . . . .. . . . . . . ... . .Magazine catch pin . ... . ......... . . .. ...... .Frame end plate ........... . . . . . . . . . . . . . . . . .Frame end plate screw .. ... . . . . . . .. .. . ... .Ejector trip block ..... . .. . . . ........ . ... . . .Ejector 1rip block nut . .. . ... . . . .. . ...... .. .Breech block guide plate . . . . . . . . . . . . . . . . .Breech block guide plate latch ......... .Frame lid locking bolt ... . ... ....... . ..... .Rear sight base .... . .... . .. . . . ..... . .. . ... .. .Rear sight leaf .. . . . . . . . . . . . . . . . . . . . . . . . . . .. .Rear sight hinge screw .. ........ .. . . .... .Rear sight leaf spring ...... . .... . ... . .... .Rear sight slide . . . . .. . . ...... .... . .. . ....... .Rear sight slide catch ..... . .... . . .. ...... .Rear sight slide catch spring . .... ... . .. .Rear sight base rivet .. .. . . ... . .... . .... . .. .Foresight ... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ... .Foresight protector screw .. . .... . .. . .. . .Pin for No . 3 . . .. .. .. . . . ........... .. . . .Pin for No. 33 .. . . . . . ..... . . .... . .... . .. .

1

18 II19 1 1>20 I2830293139404243363724710I I91213148256

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2 1 II

Documents

Description Madsen