24 sedteiuber19&4 military specification e. applicable

MIL-G-13665(Ord&24 SeDteIUber19 4

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MILITARY SPECIFICATION

GUN, MACHINE, BROWNING, CALIBER .30,(WITH SPARE PARTS)

ML919A6

1. SCOPE

1.1 This specification covers one type of Brouming,Caliber .30, Machine Gun, with shoulder stock and biped mount,emd known as Gun, Machine, Browning, Caliber .30, M1919A6.

e. APPLICABLE DCCUMENTS

2.1 The following specifications, standards, dravings, endpublications, of the issue in effect on date of invitation forbids, form a part of this specification:

SPECIFICATIONS

MILITARY

MIL-P-12362 - Packaging of Machine Gun Browning,CaLiber .30, M1919A6

U. S. ARMY

52-0-1 - General Specification Governing the Manu-facture end Inspection of Smell Arms Weapons,Spare end Replacement Parts, ad Accessories

DRAWING

ORDNANCE CORPS

D7142395 - Gun, Machine, Chllber .30, Brovning, hZ919A6

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MIL-G-13666(Ord)

PUBLICATIONS

ORDNANCE CORPS

ORD-SIP-S6 -

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Ordmnce Standard Inspection Procedurefor Guns. Machine. Caliber .30. Browning.M1917Al,-M1919A4 Fixed and Flexible, ‘“M1919A5 Fixed, and M1919A6

(Copies of specifications, standards, drawings, end publi-cations required by contractors in connection with specificprocurement functions should be obtained from the procuringactivity or as directed by the contracting officer.)

3. RXQUIRR411NTS

3.1 m.

3.1.1 Materials.- Materials shalldrawings end specifications, or shall beagency.

3.1.2 Manufacture.

conform to the applicableapproved by the procuring

3.1.2.1 Ganerel.- Braxing, welding, heat-treatment, pro-tective coatings for corrosion protection, riveting, staking,and other manufacturing processes shall be as specified in theapplicable drawings and Specification 52-O-1.

3.1.3 Additional suecific requirements.

3.1.3.1 Sarrel.- The eol.argementof the chamber due toproof-firng shall not exceed 0.001 inch. After proof-firing, thedimensions of the chamber and bore shell not exceed the limitsshown on the applicable drawing.

3.1.3.2 ~ - Following proof-firing, dimensions of thebolt shall be within the limits shown on applicable drawing, withno set-back of the face. All operating surfaces shall be smoothand free from any defects which may affect its functioning. TheT-slot shall be free from any roughness which may intensify thecollection of brass particles during feeding or extraction ofcartridge cases.

3.1.3.3 Cover assemb~ .- The belt feed lever, slide,andpawl shall function smoothly when assembled to feed from ei’therleft-hand or right-hand side.

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MIL-G-13665(Ord)

3.1.3.4 Extractor assembl~. The extractor aesembly ehallpivot emoothly In the bolt. The ejector and the extractor camplunger shall”act freely under their aprlng tenelon.

3.1.3.5 DrlvlnR aDrinR rod essembly. The driving eprlngrod assembly ehall move freely in the bolt when both are aaeem.blad in the cesing eaeembly.

3.1.3.6 Firinu Pin aaaembl~. The firing pin aesembly ehellslide freely in the bolt. here shall be no hand-atoning of thestriker point. The eear engaging notch ehell have a fine finishend the forward edge ehell be eharp and free of wire edges andburrs.

3.1.3.7 sDrims. - All springs shall be capable oi’gym-nastication testing in accordance with the applicable drawings.

3.1.3.8 Lockim? devices. All locking devices shall main-tain ‘properad]uatment during firing and during handling of theweapon.

All other parts shall conform to~ the ~~tii;n;;;;;i;?;~”itiits shown on the applicable drawings.

3.2 Manufacturing assemblies.- AIIassembly consisting oftwo or more parts combined for machining or other operationashall conform to the requirements specified for individual parts.

S.3 ~are mrts. - h%en specified, machine guns shall beaccompanied by a proportional.quantity of spara parts. Thequantity of each part furnished shall be as epecified by theprocuring activity. (See 6.1.)

3.4 Assembled uuns.

3.4.1 The gun shell be assembled aa shown on theapplicable draw~gs =d in a reamer to meet the following re-quirements before and after all firing tests.

3.4.1.1 Cockiw lever. The cocking lever shell retractthe sear engaging notch of the firing pin not lees then 0.010inch beyond the engaging point of the eear.

3.!+.1.2 Piring pin protrusion. The firing pin ehall pro-trude from the face of the bolt 0.060 to 0.068 inch when in theforward or firing position.

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MIL-O-l~665(Ord)

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●of the gun shall be .suohthatThe timing

be releaaed3.k.l.3 ‘Mmlm.

the firing pin cannot when the diatenoe between theforward ed8e of the barrel exteneion end the tnuuiion blook 180.120 inch, and such that the firing pin oan be releaaed beforethie distanoe la reduced to 0.030 inch.

3.i+.l.4 Tri&b?er Pull. The trigger pull necessary to op-erate the gun ehall be 7 to 12 pounds-when meaeured at the centerof the bow in a line at right anglee to the bore and parallelwith the aide plates. The meaauremant may be made with the backplate removed. The wbapone eubmltted to the endurance teat”specified herein shall ~oecapable of meeting at i.east75 percent of the original.specified trigger pull uponcompletion of the endurance test.

3.4.1.5 Headspace.- Each completed weapon shell bewithin the proper headspace requirements when gaged with a.123-inch “go” end .128-inch “not go” gage.

3.4.1.6 Cyclic rate.- The rate of fire shall be withinthe range of 425 to 550 rounds per minute using U. S. Governmentcaliber .30 standard service ball ammunition when firing fromthe biped mount. The normal rate may be expected to be withinthe range of 500 to 650 rounds per mimte when mounted on arigid test stand approved by the Government inspector.

3.5 Marking.

3.5.1 COmDleted weapons.- Unlees otherwise specified,each @u? shell be marked in the position and size specified onthe drawings end as specified in Specification 52-0-1.

3.5.2 Components.- Components and assemblies shall bemarked with the manufacturer’s symbol, the Ordnance part numberonly, or both, as specified on the part number Identlficatlondrawing or the individual part drawin~.

3.6 Gwnnastication.- Each completed gun shall be placedin a gymnastication fixture furr.ishedby the contractor andmechanically gymnasticated for a minimum of 500 cycles priorto any firing tests.

3.7 Proof-firing.

3.7.1 Assembled guns.- Each gun shall be capable of with-standing proof-firing with one U. S. Government high pressureproof cartridge without’structural failures or distortions thatwould affect functioning of the weapon.

3.7.2 Suare barrels. barrel extensions. end bolte. – Eachbarrel, barrel extension, and bolt intended “as spare parfs shell

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o MIL-G-13665(Ord;

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be proof-fired using one proof cartridge each. Fixtures forproof-firing these parts shall be provided by the contractor.Following proof-firing, these parts shall meet the requirementsspecified herein and on the drawings.

3.8 Function firin&.- Each assembled gun shall be capableof withstanding the fiction firing test specified herein,wlthno breakeges or malfunctions of the gun or biped mount, usingstandard U. S. Government caliber .30 ball ammunition in metallicbelts.

3.9 Endurance firing.- Assembled guns shell be capable ofwithstanding an endurance test Of 10,OOO rounds when tested asspecified harein. Breakeges end malfunctions shall be limitedto those specified in table I. U. S. Government standard caliber.30 ball ammunition, in metallic belts, shall be used in the test.

3.10 Accurac~.- Accuracy of the weapons shell be such thatat least nine rounds of a 10-round burst, fired full machine gunaction, shall group within a 3-inch circle when fired at a 100-foot range. Romds that cut the edge of the 3 inch circla .shall be considered as acceptable.

3.11 Lubrication.- Each machine gun shall be adequatelylubricated t~;h;u; ~1 firing tests end prior to Governmentacceptance. . .

3.12 Workmanshi~.- Standards of workmanship shell be suchthat equipment will meet the requirements of 3.1 through 3.11.All components, subassemblies, parts, and the final assemblyshall meet the inspection requirements for defects in quality anddimensions as specified in 4.3.

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,., ,. ...TABLE 1.-‘Msliun6tioEs;ti$okenparts; &ridnoriaccebtableconditions

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Number pemitted inkaiiliiia%idnaU“ Miolidptatd &mjdt&Qla the andtimnaatest

F&at 3000 Seoond 6W0-da roundi

Enlsrged [email protected]..:...........................~tnded primers,anlargedfiringpin hole.............Pailureof Istoh.......................................Failureto close,duoto anygunomnpanamt........i....Failureto ejaot.......................................Failureto mtraot oartridge oaae from chamber.........Failure to extraot onrtridge from feed belt...........Failure to feed, bullet striking faoe of barrel ........Fhilure to feed, insufficient reboil...................Psilure of triggerto release..........................Fkultytriggerpull....................................Hangfire,notioea~le..’.................................Miafire ................................................Piereedprimer................................'..........Partialignitio n.....................................Suptured oartridge ease................................Un.aantrolledfire......................................Other mmlfunotiana, total..............................

Broken or Unserviceable Parts

Aooele~tor, br.aken....................................Barrel@,eroded........................................Barrelaxtanaion, broken...............................Belt,brokan...........................................CooHng lever, broken, burred, or worn. ................Cam, brokaa...........................................Ejeotor, broken........................................Rxtraotor.aasambly, broken, burred”,or deformed........~raotor oam, brokan or burred........................Firing pin, brogan.....................................Firing pin spring, brokemor act.......................Rivets, 100me..........................................Beltfeedpawl,brokenor burred........................Beltfeedolido, broken or burrad......................Sear; brok~ ...........................................Sear eontaots, defeotiwe...............................Side or. bottom platen, spreador brogan................Strikerpoint,defe.ative...............................Setbaokinfaoeof bolt................................All otherbrokanparka.................................

0010

;o0000010000s

o211211100

@.o210106

00000000010000000000

o000

;o11000110@.

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l.n ~~eatea no ~1~ if anoonntered during the ~du*Oe teat.

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iIL-G-13665(Ord)

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4. Q.MLITY ASSURANCE

4.1 Lot size.

4.1.1 ~- The lotor complete sets of Darts.

PROVISIONS

size of completely assembled guns,components. and assemblies therefor

submitied for inspec~ion,-$heli be es-determined by the Govern-ment inspector end contractor based upon existing conditionsend facilities.

4.1.2 Spare parts.- ‘fienspare parts are specified by thecontract, the lot size of those parts submitted for inspectionshall be any quantity, but not less than a quantity proportionalto the lot of completely assembled guns submitted for finalinspection.

4.2 SSMDlin&.

4.E.I. a - Unless otherwise specified herein for flrlngtests, inspection and functional tests shall be performed on eachsun. Unless otherwise specified; non-conformance to.drawinss endall specified requirements shell constitute a critical defect andshaLl result in the rejection of the gun, until SUCH defect hasbeen corrected.

4.2.2 ~. - Sempling procedures for less then 100 per-cent inspection shell be in accordmce with the standard samplingprocedures of ORD-SIP-S6.

4.2.3 ACCeDtSnCe or reelection.- The claseiflcation ofdefects and acceptable quality levels (AQL~s) of ORD-SIP-S6 shellbe used as the basis for acceptance or reJectlon of en inspectionlot.

4.3 Insoection.- Inspectlon shall be performed in accordancewith Specification 52-O-1, ORD-SIP-S6, and this specification.

4.4 Gadng.

4.4.1 Firing Dln protrusion.- Each machine g~l shall begagad to determine conformance with firing pin protrusion re-quirement. The guns shell be 8aged before end after the firingtests. Any gun not meeting this requirement shaLl be rejected.

4.4.2 Heads~ace.- Each gun shall be gaged to determinethat the specified headspace requirement has been met. The gunsshall meet this requirement before and after proof-firing, aftereach 4,000 rounds in the endurance test, and upon completion ofthe endurance test without further adjustment. Any gun notmee”tingthis requirement shell be re~ected.

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MIL-G-13665(Ord)●

~h~llbs~’?ea~;~%requirement specified herein.quirement shall be rejected.

trigger pull of eaoh machine guncompliance with the trigger pullAny gun not meeting thie re-

4.5 Teeta.- Teata ehall be performed in accordance withSpeoif’icat-~2-O-1, ORD-SIP-S6, end this epecificatlon.

4.5.1 Proof-firing test.- Each aseembled machine gun andeach spare barrel, barrel extension, and bolt ehall be proof-flred using one caliber .30 Ml high pressure test cartridge fez!each gun or part teated.

4.5.1.1 Any etoppage or failure of any part ehall becauee for rejeotion of the gun or of the part being tested.The chamber and the bore of the barrel shall be gaged afterproof-firing to deteruiinecompliance with the requlraments apec-lfled herein end on the drawings. If the parts specified aboveare found acceptable, proof marka shall be s“tampedin the loca-tione specified on the drawings.

1.5.2 F1.mctionflrim teat.- All weapons that have auc-ceasfilly completed the specified proof-flrlng teat shall befunction fired according to the following echedule.

4.5.2.1 The first 100 guns produced under each contractshall be fired 100 rounds each. Firing shall be in interruptedbursts except that one continuous burst of 25 rounds shall befired from each weapon.

4.5.2.2 Every tenth gun.produced thereafter shall befired 75 rounds each with not less than 20 rounds fired in onecontinuous burst.

4.5.2.3 All other guns produced shall be fired a totalof 35 rounds each In interrupted or continuous bursts.

1.5.2.1 Any breakage or malfunction of’any of the guaashall be cause for rejection.of the gun being function fired.In addition. if the breakage or malfunction occurs in a weaponbeing flrea in the 35 round.schedule, the next 10 weaponsshall be function fired In the 75 round schedule as specifiedherein. If these 10 weapons pass the 75 round test successfully,the origin%l schedule specified herein shall be reapplied.

4.5.2.)+.1 Malfunction or atoppagea resulting from de-fectlve ammunition o??llnka in any firing teat shall not bacharged agalnat the weapon being teated.

4.5.3 Rate of flre.- The cyclic rate of fire shell be de-termined for every tenth gun produced, the test shall be conductedconcurrently with the function firing test. The rate of fire

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shell be within the ranges specified herein. Failure to meetthe cyclic rate requirements shall be causa for determiningthe cyclic rate on the next ten guns. If the 10 guns pass thetest successfully, the test procedure shell revert back to sche-dule specified above. Failure to meet the cyclic rate with eachof the 10 guns shall reject the lot represented by the testweapons.

4.5.4 Endurance teet.- Thg fjndurencetest shall be con.ducted according to the following schedule.

4.5.4.1 One gun from the first 100 weapons produced shalloe subjected to an endurance test of 10,000 rounds. Firingshall be at the rate of approximately 50 rounds per minute,in bursts not exceeding $?0rounde. The test weapon shall beallowed to air-cool for 5 minutes after each 500 rounds and for10 minutes after each 1000 rounds.

4.5.4.2 men the test weapon rapreaenting the initial 100guns hae succeaefully passed the above teet, one gun from eachsucceeding tenth lot of 500 weapona shall aleo be fired in the10,000 round schedule specified in 4.5.4.1.

4.5.~.5 All other lote shall be tested by aubject~~ ~;:o weapon from each lot to a 5,000 round endurance test.ditiona of firing ehall be the same aa for the 10,000 round test.

b. 5.4.4 Test weapona shall be cleaned and oiled afterevery 500 xwunds but no parta shall be altered or raplaced ex-cept for broken parte or those parte worn to the extent of un-serviceability. A record shall be kept of each replacement.

4.5.4.5 The lot from which the teet weapon was drawn shallbe acceptable if the test waapon withatenda the endurance testwithin the limits apecii’iedin table I.

k.5.4.6 The test Weapone eubmitted to tha endurance tastshall not be accepted by the Government until they have beenthoroughly reconditioned by the contractor.

4.5.5 Accuracy test.- One gun froa each lot of gum shallbe submitted to an accuracy teat. The gun shall be mounted ona fixed reet approved by the inspector or on a standard caliber.~O tripod mount faataned to a eulteble base. Tha gun shall befired on a 100 foot range to determine compliance with accuracyrequirements. Gune which fail to meet thla requirement shalloe rejected end the lot shell be screened for the defect. Oneadditional gun from the same lot shall then be tested foraccuracy with the lot accepted or rejected on the performanceOf this second gun.

o Retests.-4.6. Weapons reJected in any inspection or test,except in the endurance test, may be conditioned ond resubmit-

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MIL-G-13665(Ord)

ted for the inspection or teat in which failure oocurred. TheGovernment inspector.may, in addition, eubject the resubmittedguns to such other tests as he deems neceesary. If resubml.s8ion1s allowed, the entire lot of guns ehall be checked and condl.tioned for the feilure or failures.

11.6.1 A retest ehall be allawed in the case of guns re-jected beoause of failure in the endurance test unless, in theopinion of the Government inspector, the failure or failures in-dicate serious defects in the lot of guns. In such a caee, aretest shall be made only if authorized by the contracting of-ficer and after the entire lot hae been reconditioned where net.e.scary. In the event that a retest ie made, the Government in-spector shall take at random from the rejected lot a weaponto be subjected to the same endurance test. Failure of theweapon in retest shall be cause for final rejection of the lot.

!4.7 Final acceotan~ - The weapons shall be finally ac-cepted after having paeaed the inspection end tests specifiedherein, been stamped with the inapectorts etemp and with theOrdnance Inspection Stamp, and packed for shipment as specifiedherein.

5.

5.1shipment

PREPARATION FOR DELIVERY

Weapone.- The assembled weapons shall be prepared fora~fied in Specification MIL-P.12362.

5.2 Spare parts.- Spare parts shall be packaged endpacked in accordance with the spare parts packaging drawingfurnished by the contracting officer.(see 6.1)

6. NOTES

6.1 OrderinR data. Procurement doCumOntB should specifythe following:

a. Title, number, end date of this specificat.ton.b. Title, number, and date of applicable drawings.C. List of Spara parts, when reqa.ired. (see 3.3.)d. Site of inspections end tests.e. Spare parts packaging drawings. (See 5.2.)

6.2 Suggeeted contract.lralfeaturea.

6.2.1 Serial numbere. -a block of serial numbers to(See 3.5.1)

The contractor should be furnishedbe used for weapon identification.

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oMIL-G:13665(Ofd)

6.2.2 Description of msnufactum. Upon request, the con-tractor aho~d be furnished a daacrlption of manufacture pre.

I V1OUO1Y employed in the manuf.sotureof this weapon.

6.2.3 Additional drawings and speclflcatlona. Upon request,with reaaone herafor, the contractor should be fumlehed any

Ireferenced drawlnge and spaclficatione he may deair6, in edditionto those originally furniehed by the contracting officer aenecessary for the materiel contracted for.

6.3 Lubrication. Lubrication Order L09-244 ehould befumiehed _Ehecontractor to facilitate correct lubrication.

6.4 Safety durinu firing. Cara is essential to assuresafety during firing. Tha chamber and bore should be dry, clean,end free of obstructions. Proof cartridge ehould be ahakan tovarify that the powder la loose before using. In the event ofa hangfira, the aotion of tha gun should not ba opened for atleast 30 aeconde, end then should be opened rapidly by meene ofa lanyard taking precaution for the eafety of parnonnal.

6.5 Defective ammunition. If defective ammunition of anytype is encountered in any firing teat, the Commanding Officer,Frankford Arsenal, should be notified end samplee submitted for

o examination and information.

6.6 Defective belt links. If defective belt links areencountered in any firing tea&, the Commanding Officer, RockIsland Arsenal, ehould be notified and eemples submitted forexamination and information.

Notice: This specification, together with specificationand drawings pertaining to It and bearing a ‘NOTICEn of eimllarreatrictione, ie intended for use only in connection with pro-curement by the United Statea Government, end shall not be re-produced either wholly or in part excapt when authorized in con-nection with Government procurement, nor ba used for any otherpurposa except when specifically authorized by the Chiaf ofOrdnance.

I Cuabodisn:

Amy - Ordnance Corpe

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v.rtusant or c ntr ctor, involved in the use vic.ti.n I. proc. remmt o pm ..cnf.. ., tymta use

nimm munt .} ,*1*Y ml.! the le..t c .t.ining i. fc.rmt”m . . the u . of tht. .pec. fx. mtt n which .i 1 n.. ra that w’~ab e prod~ . . . b. pro. red .’ h .

?bmmnt. .Q~ t&. w... of t~~. I.rm .i~~ 6. .ppr..i.t.$. Fol~ . .c.. on rev. r.e ., e, .Cnp e ,r, corn.,, anx mend to prep,r,r,~ .ct,vtty (., tnd{e. t,d . . r,.,,,, h,r.. f).

~CIFI CATION 7

FJii-mTl 0N (of ,. b.itt. r) CIIY ANO sTATE i

?TUACT No. OuAmTwb—F 1TEMS ?’R’6CURED DOLLAR AMOUNT

$TERIAL PRoCURED UNDER A

❑ DIR,,, ,OV,RNM,N? iONT,AC1 ❑ SU8CON1RACT

HAS MiY PART OF THE SPECIFICATION CREATEDPROBLEN9ORREQuIREDINTERPRETATIONINPROWREMENTUSE74, 91VI *ARAORb?HNuumIn AND mOnO!Na.

1. RSCOMME”DA71ON, IOR CORRICTINO THE D1fl CllNCI ES.

C0WEY4TS ON ANY SPECIFICATION REQuIREMENT CCUSIDERED TOO RIGIO ~

IS THE SPECIFICATION RESTRICTIVE?

o v,, o NO 1, *YES”, 1“ -81 .*Y,

REMARKS (Attach any ●rtine. t data .hich ..y b. of .s. i.. i.pr.o. i.a thi. .p.. ifjc.ati. n. If thsre .r. ,.ddi -{tnon.1 paper,, .tt.c tof.,. andpla..both i. . . .nvelop. .ddre. sed to p,.p.,1.#..t,.it,)

BWITTEO w (Printed or typed . . . . and .cti. tty) DATE

DD. W“. .1426 REPLACES NAVSHIPS FORM 4863. W ICH 1S OBSOLETE C-Lls, @, “., .,


24 sedteiuber19&4 military specification e. applicable

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