engineering change report stoner 63

8/3/2019 Engineering Change Report Stoner 63

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STONER 63A

WEAPON SYSTEM

..______P.O. BOX 3806 OETR.OIT S, MICHIGAN


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REPORT ON ENGINEERING DESIGN CHANGESTO STONER 63 WEAPON SYSTEM

I INTRODUCTION

This r epor t i s being publ ished to f ami l ia r ize a l lin te res ted agencies and organiza t ions with the engin-eer ing design changes made to th e Stoner 63 Weapon System.Hereaf te r the new des igna t ion for the Stoner 63 WeaponSystem w i l l be Stoner 63A Weapon System.

I I BACKGROUND

The Stoner 63 Weapon System has been undergoingt e s t s and eva lua t ions s ince August 1963 when ARPA/AGILEevaluated th e Stoner 63 Machine Gun, c a l i b e r .223 o r5.56mm. Approximately 2400 Stoner 63 Weapons of var iousconf igura t ions have been manufactured to da te .

The United S ta t e s Marine Corps, United S ta t e s Army,and the United S ta t e s A ir Force have conducted Engineering ,Service, and Troop t e s t s to determine the Stoner 63 WeaponSystem's mil i t a ry po te n t i a l . T es t r epor t s a re presen t ly

CRDIURC GRGE Ct:IMPRNY____P. 0. BOX 3806 DETROIT 5, MICHIGAN


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being processed r e l a t i ve to the r e su l t s of the l a t e s tt e s t s .

The r e s u l t s o f these t e s t s indica ted t h a t cer t a indes i rab le c ha ra c t e r i s t i c s were lacking in the Stoner 63Weapon System, and ce r ta in def i c i enc ies required correc-t i o n . Modif icat ions were made to the System t o c o r r e c tthese def i c i enc ies and fu r the r modif ica t ions were made toimprove the Stoner 63 Weapon System's r e l i a b i l i t y as afunct ion o f normal produc t improvement.

III DISCUSSION OF MODIFICATIONS

a . Stoner 63A Rif leFigures 1 and 2 i l l u s t r a t e the dif ference

between the S toner 63 Assau l t Rif le and the Stoner63A R i f l e . A smal l arrow po in t s to each modif icat ionmade. Close-up p ic tu res of each modif ica t ion a reshown, and the modifi .cation i s discussed below.

Figure 3 shows two types of bu t t s tock pads ,the two piece pad was rep laced by a one piece pad

P. 0 . BOX 3eOEi D E i ~ O I T 5, MICHIGAN


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- - ~ T ' I ' ~ ; ; c .

RIGHT SIDE VIEW

STONER 6 3A RIFLE

STONER 63ASSAULT RIFLE

FIGURE 1


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STONER 63 WEAPON SYSTEMBUTT STOCK PAD

TWO PIECE BUTT STOCKPAD (OBSOLETE)

ONE PIECE BUTT STOCKPAD (STANDARD)

FIGURE 3


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which, when a t t ached to the b u t t s t o ck , affords theSystem a bu t t s tock pad t h a t w i l l not come o ff duringuse in th e f ie ld o r on the r i f l e range . This new onepiece pad i s made of harder mater ia l , and i s capableof being bonded to the s tock more secure ly than thetwo piece pad.

Figure 4 i s a photograph o f two t r i gge r housinggroups . The upper t r i g g e r group in the p ic tu r ei l l u s t r a t e s th e new type which has two pos i t ions fo rthe se l e c t o r l e v e r . "SEMI" and "AUTO". "SAFE"pos i t ion has been removed and a new type sa fe ty l everadded which func t ions much l i ke the sa fe ty lever onthe M-1 and M-14 r i f l e s . The t r i gge r housing groupu t i l i z e d he re to fo re i s shown a t the bottom o f thep i c t u re . The se l e c t o r l ever had th ree pos i t ions ,"SAFE", "SEMI", and "AUTO". The opera tor in mostins tances had to remove h is f inge r from the t r i gge rto move the se l e c t o r l ever to e i t h e r "SEMI" o r "AUTO"from "SAFE" in orde r to f i re the weapon a t a t a r g e t .With the new sa fe ty l ever , the opera tor needs onlyto push the sa fe ty l ever forward with h is t r i gge r

.________________@$. c : . ' : . ' : : : : ~ ~ ' : ~ : , ~ : : : : ~ ~ _____


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STONER 63A TRIGGERHOUSING. GROUP

STONER 63 TRIGGERHOUSING GROUP(OBSOLETE)


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f inger and be ready to f i re immediately, should thes i tuat ion demand i t .

The two posi t ions "SEMI" and "AUTO" are approximately 180 apart on the new t r igger housing groupwhich gives the operator a more posi t ive picture ofwhich set t ing he has and precludes any confusion onth is vi t a l point . Figure 5 i s a close-up view of thenew safety lever in the forward or "FIRE" posi t ion.Figure 6 shows th i s safety lever on "SAFE" or in therearward posi t ion, back inside the t r igger guard.

The difference between the new and old t r iggerguards i s twofold. The new s ty le t r igger guard i ss lot ted to permit the new safety lever to move backand for th , and i s welded to the t r igger housing. I tcannot be detached, as it was possible to do with theold type t r igger guard. Too many t r igger guards werelos t during t e s t s , consequently a change was desirableon t h i s feature . The detachable t r igger guard wasoriginal ly put on the Stoner 63 Weapon System topermit the operator to remove the t r igger guard and

L--- - - - -0 . 0 . BOX 3806 DETROIT 5, MICHIGANCRDILI.RC GRGE C#IWPRNY____


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SAFETY FORWARDIN "FIRE" POSITION

STONER 63 A RIFLEEJECTION PORT COVER

OPEN

FIGURE 5


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SAFETY TO REARIN "SAFE" POSITION

STONER 63A RIFLEEJECTION PORT COVER

FIGURE 6

ee


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be able to f i r e the weapon with an a rc t i c mit ten on.The new type t r i gge r guard cannot be removed, con-sequent ly a winte r t r i g g e r at tachment i s necessaryto prov ide the opera tor the same capab i l i ty . Figure7 shows one type o f at tachment t h a t i s being eva lua ted .

Figure 5 also shows th e e jec t ion p o r t cover inth e open pos i t ion . This cover has been added to th eStoner 63A Weapon System to promote g r ea t e r r e l i a -b i l i t y during extended f ie ld opera t ions where theopera tor cannot c lean h is weapon read i ly . Thisfea ture i s espec ia l ly h e lp f u l on the Machine Gun andAutomatic Rif le vers ions due to the f a c t t ha t theb o l t i s in the rearward pos i t ion when ready to f i r e ,consequent ly the e jec t ion por t i s open permi t t ingd i r t and dus t ready access to the ins ide par t s of theweapon. The cover can be c losed as i l l u s t r a t ed inf igure 6, during use in any s i t ua t ion . When the b o l tgoes forward it automat ica l ly opens the cover to permi te jec t ion of th e spent c a r t r i d g e . The opera tor mustmanual ly c lose it to cont inue ob ta in ing fu r ther bene-f i t s of t h i s fea ture

.._____0 CRD,LLRC GRGE COM.PRNY ____P. 0, BOX 3806 DETROIT 5, MICHIGAN


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This e jec t ion p o r t cover i s a r e s u l t of t h i sCompany's product improvement e f f o r t , and i s incorp-ora ted on a l l conf igura t ions o f t he Stoner 63AWeapon System.

During extended f ie ld exe rc i se s and t e s t s , botha t nigh t and during the dayt ime, it was obvious t ha tthe i n se r t ion of the ammunition magazine in to theweapon requi red some s k i l l and t ra in ing to accomplishquickly . Figure 8 dep ic t s the new s ty l e magazine wel lt ha t so lves t h i s problem. The magazine wel l i s ex-tended and f l a red to f a c i l i t a t e the in se r t ion o f themagazine in to the weapon quickly . The f l a red por t ionac t s as a guide fo r i n se r t ion of th e magazine in to i t sproper p lace .

Figure 9 i l l u s t r a t e s the Stoner 63A and Stoner 63Rif l e and Carbine Cocking Handle . The new type cockinghandle i s loca ted on top of the r ece iver which permi t sthe ope ra to r to charge th e weapon with e i the r handwithout undue e f f o r t . The new type Rif le and Carbinecocking handle has a fea ture incorpora ted in it, t ha t

C R DIUR C ' GR G E C'DMPRNY ____P. 0 . BOX 3806 DETROIT 5, MICHIGAN


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COCKING HANDLE FORRIFLE & CARBINE

FIGURE 9

OLD


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permi ts the opera tor to push the b o l t forward ifnecessary . This i s done by pu l l ing back the handle tothe po in t where it becomes engaged with the pis ton rod,and then pushing the plunger i n s ide the cocking handledown. Then, whi le keeping it down, push forward to a s s i s tthe b o l t to c lose . Figure 10 shows a close-up view o ft h i s added f ea tu r e .

Engagement con tac t area of th e new type cockinghandle with the p is ton rod has been inc reased. Theold type cocking handle became disengaged from thepis ton rod on occasion due to the smal l contac t area .

Figure 11 i l l u s t r a t e s the changes made to thegas cy l inder . To inc rease the se rv ice l i f e o f t h i sc r i t i c a l i tem, the d ~ a m e t e r o f the gas cy l inde r fo r ward o f the b a r re l guide , was inc reased. The mate r i a lwas changed to 17-4 PH s t a in l e s s s t e e l .

During the ex tens ive t e s t ing conducted in th ef ie ld and l abora to r i es , it became ev iden t t ha t thepis ton rod would "freeze up" in the gas cy l inde r when

..._____P. 0 . BOX 3806 DETROIT S, MICHIGANCRDIURC GRGE C'OMPRNY ____


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MACHINE GUN FORESTOCKMOUNTING PLI\.TE

BOLT FORWARDASSIST PLUNGER

RIFLE AND CARBINE .COCKING HANDLE

FIGURE 10


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.062 INCH WALLTHICKNESS

09 3 INCH WALLTHICKNESS

GAS CYLINDERSTEEL (4130)(OBSOLETE)

BARREL GUIDE

GAS CYLINDERSTAINLESS STEEL (17-4 PH)

(STANDARD)

FIGURE

...


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carbon build-up reduced the clearance between thepiston head and the gas cyl inder . Figure 12 showsthe carbon r e l ie f groove inside the gas cylinderwhich eliminates th i s problem, and permits the weaponto be f ired over a longer period of time without beingcleaned.

The Stoner Weapon System barrels have beenhardened by an addi t ional manufacturing process whichwi l l provide the barre l with a harder chamber, bore,and outside surface. This prevents malfunctions dueto the fac t tha t sand and/or d i r t enter ing the chamberwil l imbed i t s e l f in the cart r idge case instead of thechamber wal ls . I t prolongs the l i fe of the barre ltremendously and re tards corrosion throughout theoutside and inside surfaces when ut i l ized in a warm,high humidity environment.

Recent t e s t s a t Springfield Armory on two of thehardened Machine Gun barre ls tha t were fi red a t a ra teof 200 rounds per minute for t h ~ minutes without

,~ / , " : : : : t : : : ~ , : = - - - - - . P. 0 . BOX :3606 DETROIT 5, MICHIGAN


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can be f ired before the barre l becomes unserviceable.Under a less r ig id schedule a longer l i fe can be ex-pected. The previous barre l became unserviceable,f i r ing the same schedule, af te r approximately 8,000rounds.

b. Stoner 63A CarbineFigure 13 shows the Stoner 63 Carbine before and

af te r modifications. All modifications discussed inparagraph a . above are applicable to th i s weapon withthe addition of the folding stock which is discussedbelow.

Figure 14 i l lus t ra tes the two folding stocksavai lable . The standard folding stock i s fabricatedout of 22 par ts . The wire folding stock consists of14 par ts and is f l a t against the receiver when folded.The polyvinyl chloride coating on the wire stock e l i -minates the cold metal contact with the operator 'sface and helps deaden noise during movement throughunderbrush.

CRDILI.RC GRGE CDMPRNY ____P. 0. BOX 3606 DETROIT 5, MICHIGAN


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c . Stoner 63A Automatic Rif leFigure 15 dep ic t s the Stoner 63 Automatic Rif l e

before and a f t e r modi f i ca t ions . The modi f ica t ionsa re poin ted ou t by smal l arrows.

Figure 16 shows the old and new magazine adap terassembly. The new one i s extended and f la red to fac i -l i t a t e loading the magazine . The f l a red extens ion ac t sas a guide and permi t s rap id reloading day o r n igh t .

Figure 17 shows the new and o ld cocking handles .The new cocking handle has a more pos i t ive engagementwith the p is ton rod than the o ld cocking handle . Ita lso has i t s l a t ch spr ing a t t ached to the f ron t end,which locks it in th e forward pos i t ion during f i r i ng .The new cocking handle can be disengaged from i t slocked pos i t ion with approximately 10 to 12 poundsp u l l as compared to the o ld cocking handle which re -quired approximately 25 pounds p u l l .

CRDILLRC GRGE COMPRNY____P. 0 . BOX 3806 DETROIT 5, MICHIGAN


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MAGAZINE ADAPTERASSEMBLY

STONER 63 ASSEMBLY(OBSOLETE)

STONER 63A ASSEMBLY(STANDARD)

FIGURE 16


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MACHINE GUN'COCKING HANDLE

.. STONER 63A; (STANDARD)

i STONER 63i (OBSOLETE)

. FIGURE 17

LATCH SPRING


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Figure 18 shows the Stoner 63A Machine Gunfo res tock assembly which i s a lso u t i l i zed on theStoner 63A Automatic R i f l e . The new p la s t i c fo re -stock w i l l do away with the wooden fo res tock whichwas not durable enough fo r rough f ie ld usage. Inorder to assemble t h i s p l a s t i c fo res tock to theAutomatic Rif le and th e Machine Gun, the mountingbracke t was re loca ted and a mounting p la te was added.These modi f ica t ions a re shown in f igure 19.

In orde r to s l ing the Stoner 63A AutomaticRif l e over your shou lder and carry it a t the "Ready"pos i t ion , a top s l ing a t t ach ing r ing was added to thef ron t end o f th e car ry ing handle rod as shown inf igure 20. A ll Stoner 63A Weapons can be car r iedby the f i r e r in t h i s manner.

The hardened ba r r e l , new type b u t t stock pad,sa fe ty l ever , and se l e c t o r l ever u t i l i z e d by theRi f l e and Carbine are a lso used on th e AutomaticRif l e .

L - - - - - 0 .O . BOX :3806 *' DETROIT 5, MICHIGANCRDIURC GRGE COMPRNY ____


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FORESTOCKMOUNTING PLATE

MACHINE GUN FORESTOCKMOUNTING BRACKET

OLD LOCATION

FIGURE 19

NEW LOCATION


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d. Stoner 63A Light Machine GunFigure 21 depicts the Stoner 63 Light Machine

Guns before and af ter modif icat ions. The modifi-cations are pointed out by small arrows.

The feed t ray manufactured to date uti l izedstamped par ts which were welded together. Warpingresul ted which required ext ra processing to insurere l iabi l i ty of functioning. This t ray was susceptibleto damage in the f ie ld when not careful ly handled. I thad a l ink guide and a cart r idge stop which were attachedto the t ray by two small screws and two small holdingpawls. The two hinges were also welded to the t ray .

The new feed t ray i l lus t ra ted in f igures 22 and23 i s constructed in a solid s tee l investment castingin which the hinges and cart r idge stop are an in tegralpar t . I t has a wide single holding pawl and the l inkguide i s riveted on. The project ion tha t causedpersonnel to bark t he i r knuckles when cocking theweapon has been eliminated

....____P. 0. BOX 3805 DETROIT 5, MICHIGANC'RDIURC GRGE C'DMPRNY ____


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STONER 63A LIGHTMACHINE GUN

STONER 63 LIGHTMACHINE GL'N

FIGURE 21


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STONER 63(OBSOLETE)

FEED TRAY ASSEMBLYTOP VIEW

.,

FIGURE 22

STONER 63A(STANDARD)


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STONER 63(OBSOLETE)

FEED TRAY ASSEMBLYUNDERSIDE VIEW

.FIGURE 23



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The feed cover was made of stampings which werewelded together . The stamped cover was funct ional ,which required extreme f latness and squareness, andwas readi ly susceptible to damage in .the f ie ld . I thad four hinges requiring extreme care in weldingto prevent misalignment of the feed cover to thereceiver . The cover was open in many areas, whichpermitted d i r t and dust to enter the mechanism duringexercises in the f ie ld . Closing th i s feed cover onthe receiver when the bol t was forward caused dis-tor t ion and bending, which in turn caused it to mal-function.

The new feed cover shown in f igures 24 and 25i s an envelope for the r ig id cast par ts th at includethe front and rear r a i l for the feed pawl assemblyand the hinges. This cover i s so constructed tha ta l l possible entry areas for d i r t and dust are closedoff . There i s a spring loaded cover over the l inkeject ion port which opens under the force of the l inkbeing ejected, and closes automatical ly when f i r ingceases. Figure 26 shows the cover in i t s closed

.._____ CRD,LLRC I IR I IE COIWPRNY____P. 0. BOX 3806 DETROIT 5, MICHIGAN


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FEED COVER ASSEMBLYTOP VIEW

FIGURE 24


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STONER 63(OBSOLETE)

/

PZ!iG W 2 U ; M ':'-'1"'

FIGURE 25

FEED COVER ASSEMBLYUNDERSIDE VIEW


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posi t ion and figure 27 shows it open.

Figure 28 depicts the new and old cap car r ie rassemblies which afford the Stoner 63A Machine Gunwith the capabi l i ty of closing the feed cover regardless of where the bol t i s . The ro l le r i s mounted ona frame tha t is spring loaded and dove-tai led intothe cap car r ie r to permit ver t ica l movement. Whenthe cover is closed with the bol t in the forward pos i t ion, the ro l l e r assembly moves down into the capcar r ie r s lots , and upon the rearward act ion of thebol t , it comes up into the feed lever automatical ly.

This modification was necessary to prevent damageto the feed lever and feed cover during f ie ld use.Personnel ins is ted on closing the cover regardlessof the bo l t ' s posi t ion unless they were well t rainedin the use of the Machine Gun. This modificationwi l l reduce the t ra ining time requirement and preventdamage to the feed cover.

'-----0 RD,I.LRC G R G E C O M P R N Y ____F'. 0. BOX 3806 DETROIT 5, MICHIGAN


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CARRIER, PISTON AND BOLTASSEMBLY

FIGURE 28

STONER 63 (OBSOLETE)CAP CARRIER ASSEMBLY

STONER 63 A {STANDARD). CAP CARRIER ASSEMBLY


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During the ex tens ive t e s t s conducted by theUnited S ta t e s Army and the United S ta t e s MarineCorps, personnel con t inua l ly barked t h e i r knuckleson a pro jec t ion on the feed t ray when charging theMachine Gun. To preven t t h i s , the charging handlewas made longer , which requ i red a r e loca t ion of thecocking handle guide as shown in Figure 29. Theman's knuckle i s now to the r ea r o f the s l i gh tpro jec t ion on the feed t ray which caused the problem.This pro jec t ion has been e l imina ted on the new t raywhich f u r th e r a l l e v i a t e s t h i s problem.

Figure 30 shows the old and new f ron t s i g h tbases . The new base has been modified by adding avar iable gas p o r t . This var iab le gas p o r t a f fo rdsthe opera tor the c a p a b i l i t y of decreasing or inc reas ingthe ra te o f f i r e , where previous ly it was not poss ib l eto do t h i s . This modi f ica t ion was necessary to

compensate fo r the mismatch ex is t ing between thestandard 5.56rnm b a l l car t r idge Ml93, and the 5.56mmt r a c e r car t r idge Ml96 .

.......____0P. 0 . BOX 3906 DE:TROIT 5, MICHIGAN


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' . ' .6J'... - i ' - - ---

FIGURE 29

,:.

NEW LOCATION OF iHANDLE GUIDE II


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STONER 63(OBSOLETE)

M A C H I ~ GUN FRONT SIGHT BASE

FIGURE 30

: STONER 63A :(STANDARD)


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The same cocking handle , fores tock assembly,

top s l ing a t taching r ing , b u t t stock pad, se lec to rl ever , s a fe ty l ever , and hardened b a r re l u t i l i z e dby the Automatic Rif le are used by t he .S tone r 63ALight Machine Gun.

e . Stoner 63A Medium Machine GunA ll modi f ica t ions made on the S toner 63A L i g h t

Machine Gun and discussed in paragraph d . above, a reappl icable to t h i s weapon.

f . Stoner 63A Fixed.Machine GunAll modi f ica t ions made on the Stoner 63A Light

Machine Gun and discussed in paragraph c . above areappl icable to the Stoner Fixed Machine Gun whereappropr i a t e .

Figure 31 shows the o ld and new remote con t ro lassembl ies . A modif ied b e l l crank assembled to the newremote con t ro l assembly a f fo rds the Fixed Machine Gunwith a l e ss sens i t ive remote con t ro l . assembly than t ha tprevious ly provided.

L--- - - - -0 . 0 . BOX 3806 DETROIT 5, MICHIGANCRDI'Ll.RC G'RGE CDMPRNY ____


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STONER 63A BELL CRANK(STANDARD)

FIGURE 31

REMOTE CONTROLASSEMBLY

STONER 63 BELL CRANK(OBSOLETE)


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g. Accessor ies for Stoner 63A Weapon SystemBipod

The bipod has been modified by adding a spr ing lockingfea ture t ha t permits the opera tor to lock the bipod to theweapon so it cannot become acc ident ly disengaged duringmovement through underbrush . Figure 32 shows the oldand new bipod with the new bipod locked in the car ry ingp o s i t i o n . Figure 33 shows the new and old bipod inthe open pos i t ion .

P l a s t i c Ammunition BandoleerFigure 34 shows the o ld and new bandoleer . The

new bandoleer i s modified by the add i t ion o f t he metalre inforced top s t r i p shown in the photograph.

Round Ammunition Drum Conta ine r

Figure 35 dep ic t s a 100 round ammunition con ta ine rt h a t i s hinged and opens by unlatching tw o snap typelocks . This i s quickly detached by removal of twor ece iver pins t ha t hold it on the r ece iver . Figure 36shows a 150 round ammunition con ta ine r t h a t opens by

....._____0P. 0. BOX ~ 8 0 6 " DETROIT 5, MICHIGANCRDILLRC l'.i'RI'.i'E COIWPRNY-----


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STONER BIPOD

STONER 63(OBSOLETE)

LOCKING DEVICE

,_,FIGURE 33

STONER 63A(SorANDARD)


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turning the l a t ch in the cen te r 90 counterclockwiseand removing the back p l a t e . Figure 37 dep ic t s t h i sconta iner with the p l a t e removed.

20 Round MagazineFigure 38 shows a 30 round magazine and a 20

round magazine. The magazine can be made fo r anyreasonable number of rounds des i red . Figure 39 dep ic t sthe s t e e l 30 round magazine on a sca le ind ica t ing an8 ounce weight whi le empty. Figure 40 shows the aluminum30 round magazine on a sca le ind ica t ing a weight of 4ounces, a saving o f 4 ounces p e r magazine.

Cleaning Rod Reta in ing Bracket

Figure 41 shows the cleaning rod r e ta in ing bracke tdismounted and Figure 42 shows it a t t ached to theweapon. The t h ree sec t ions o f the cleaning rod areeas i ly removed fo r use in the f i e l d . The at tachmenti s removed from the r ece iver when conf igured as a MachineGun or Automatic Rif le .

.._____P. 0. SO X 3806 DETROIT S, MICHIGAN


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Oi le r , Patch and Brush StowageThe p i s t o l gr ip w i l l be modif ied with the addi t ion

o f a door so as to make the stowage o f the cleaninggear p o s s ib l e . The door wi l l be hinged and when openor c losed w i l l be re t a ined by i t s cons t ruc t ion . Thisfea ture w i l l of f e r the i nd iv idua l a means of car ry ingthe bore b ru sh , bore brush adapte r , cleaning rod t i p ,combination t oo l , o i l e r and cleaning patches on theweapon fo r ready access during f ie ld ope ra t ions .

engineering change report stoner 63

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