& Maintenance Manual

8/14/2019 & Maintenance Manual

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ARMAL7 TEm-18 (AR-180)OPERATION & MAINTENANCEMANUAL

* General Data* Accessories* Special Tools* Operation--Usual & Unusual Conditions* Telescopic Sight* Repair* Cleaning* Preventative Maintenance* Trouble Shooting* Disassembly/Assembly* Replacement of Parts

Armalite, Inc.118 East 16th StreetCosta Mesa, California


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OPERATING AND MAINTENANCE MANUAL

RIFLE, 5.56 - MM, AR - 18

Armal i te , Inc .118 East 16th Street

Costa Mesa, Califor nia


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TABL E OF CONTENTSCHAPTER Page

1 INIRODUCTION ___.______________________________________._.__.~__.._____.___.____________._._____.__________-e-.-e._._.-- 1 - 1SECTION1 - 1.1 - 2.SECTION

1 - 3.1 - 4.SECTION

1 - 0.SECTION

1 - 2.1 - 5.

1Genera] _____._________.___________________________._____.___.___.______._______.-.___.___..--________.-. . -.- 1 - 1Scope ___________.__________________.___.~__.._____________.__.___..__..._.________________.-_-____.___.._....__--._ - 12Description and D&..a __..___.___..__.______________________..._.__.._~_..._____._________..___.__.____ - 1Description _.___.___.____.____________.____.______._._._______.__________._______.__.._._.-_____----....-.-.-.-.-.- 13Tabulated Data _.___._________._ ...__..__.__.__ .__...__.__..__..______________..__.___.._-._...-__ -._ 1 - 14Accessories ___________________________________..____~____.___.._.__ _____________.__.--_____.-._-.-.--. - 1 - 3Special Tools ______________________________.._____._.____.____________________.____---____--.--.-. _ _---.. 1 - 3

II OPERATING INSTRUCTIONS _.____..___.._____..__.__.._.__.._ ..___.___________________________..-________-_- 1SECTION 12- 1. Ser vice Upon Receipt of Mat eria ls _...__.._.___.___.___._.___._._ ___.._____.____..____._..- 1

2 - 6. Services .___..__.__ ______________________________.._._.__ .___.__________________.___.___..___._-..--.-....--_ 2 - 12 - 9. Ripod ________.____________~._____.._.______.______.__..._..__..._.......__. __._____..___.._.-._.__ .--...__ .-.. 2 - 1

SECTION 22 - 12. Controls __________________._.__...___..._..._._...__.____._ ...__...__.._.._....___._.____.._.._._______..- 1SECTION 3

2 - 14.2 - 16.2 - 18.2 - 19.2 - 22.2 - 27.2 - 31.

SECTION2 - 33.SECTION

2-36.2 - 40.2 - 42.

Oper at ionU nd er Usu al Conditions.._ . .__..___......_____.__.________... _ .___...._____._ - 2Preparation for Firing __________.._________.. __.___.._____.___..___.___._______.__ ._________._____2 - 2Clean and Lubr icate Bolt Ca rr ier Gr oup _..._..___.__ ..__.___._ ._ ____..._______..__- 2Loading _._______________________._..__._..___..__..___._._ .___..__..______..._...__..________________._._______. - 2Firing _...____..___._________________________.._.____._.__..__.._____._____.____..__....__.._._..---.----_--_--_ 2 - 3Stoppa ge a nd Imm edia te Action Pr ocedu res ..___..___.____.__.__... .____._________ - 3Unloading __._.___..__...___._______________._.._.._...._..___.____..._________.__._._______.__.-______.__.- 44Operation Under Unusal Conditions _.._____. .__ ..._ _ .._._ .______.__.______2 - 55Telescopic Sight _________________________________________~_~___~________._____________.___..._______________ - 6Installation ____.____________________________________._____._______~________________.____._..___....---.._____....- 6Maintenance ______________________________~________________.-____..~~_.___.._________.___.___.__...._________2 - 6III ORGANIZATIONAL MAINTE NANCE INS TRUCTI ONS . .__ ._..._________.______._______.___- 1

SECTION 13 - 1. Repair Par ts, Tools and Eq uip men t . ._ _.____.__..____.._......_. ._...__.._._______._- 1SECTION3 - 8.

3 - 9.3 - 10.3 - 11.

SECTION3 - 12.SECTION3 - 14.SECTION

3 - 16.3 - 17.3 - 18.3 - 21.3 - 23.

2Cleaning and Lubricating after F iring ._.._ _ .__.....__.___..__............._........... - 1Cleaning and Lubricatin g th e Bar rel ___ ._.__..___._.______._._______________.______.____.. - 1Clea nin g and Lubr icat ing Bolt Car rie r Group .____..___.____..___..__.__._____________ - 2Clean ing an d Lubr icatin g Lower Receiver Gr oup .._....__.__...___.._.. _________ - 23Preventive Maintenance Services _ ...__..._....______...___.____.__________.__.___..____._____ - 24Trouble Shooting __________.____.__________.____.__...__..__.__ ______.._______________.____...___..__- 25Maintenance of Rifle _..__...._..._. ___.___.__.________.________.____.__._____._______.___...__...___- 3Disassembly/Assembly _____.___.._.________..__.._.._..._____..____..___.________..______.____.____..___- 3Clean ing, In spection an d Repair _.___.____..___.____.___.._____._______.__.______.___..__.__.__- 7Replacement of Par t s _.____._______.___.____..__._._.._.. ___...___..___________..______________3 - 7Function of Ch eck . ._......___..._____._._...__...__.._______..________..______________.________.____ 3 - 7i


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APPENDIXI BASIC ISSU E ITEMS LIST . ._ _.._.._________......_.____._______._____________._____.___...__________________~___- 1

NumberLIST OF ILLUSTRATIONS

Title Pagel-l Rifle, 5.56-MM, AR-18, righ t a nd left sid e views__...__________._______.......__..__..................iiil-2 Rifle, 5.56-MM, AR-18, st ock folded, le ft a nd r igh t sid e view . ._....._....____..___________iii1-3 Bayonet and Scabbard, Bipod and case, Small Arms2-l2-22-32-42-52-62-72-82-92-103-l

Cleaning Rod and Brush _.__________________________._.____._______.______._._..._..._._____._______~4Clearing Rifle __.______.__________________..____________~_________________._____________________._.____......___~_______.____21Front Sigh t Adju st men t ________..________________________________.~___________.____._.........._.______________~~___22Rear Sight Adjustm ent ________.______________._______________________________________._~_______.___.___.___~______2Removal of Bolt Ca r r ier . .__..__.___.~_____________._____..__~___._________________________4Selector Lever Operation with Stock Folded ______. ___________._______.._____....__....._...__..~ 4Rifle, 5.56-MM, AR-18 in J um p Position ______.________________________._................_________24Launching Grenade _________________.____________________.~__~_________________________________.___.................~5Bayonet _..___..._ . _._._.._____.____.___________________________________._________________.______.____...._.....____~____~5Bipod Installation .__ .__ ....____.______________________________________________.__________________........._~___~__.~5Telescopic Sight . ._._.. ._________.._ . ._.__~._.~~ .______~~____~_~_____~__________~_..____.._.~._.6Rifle, 5.56-MM AR-18 Major Groups (Bolt Carrier Group,

3-23-33-43-53-63-73-83-93 - 10

Upper Receiver Group, Lower Receiver Group) __.--____._.._.........._...___________~____34Remove/Install Oper&hg Rod Assembly __________.______.._____.__._______._............_.___~___~____34Remove/Install Hammer Pin __________________________________________ ._______________~______~4Remove/Inst all Ha mm er and H~ZID!WXSprin g __.___ . .___.~_________~_________~_.____34Disengage/Remove S&&or Lever _______________________._-________________.._.._....._._._._~______~_______34Remove/Install Trigger P in .__ ..___..______________________.________.______. .__....._._.._________________35Remove/Install Trigger __..____~__.___.___..._____.___~_____._.___~___________~~.___~________________5Disengage/Engage Takedown ___.____________________________.______________._.._._________ ._._...._..3 5With&-aw/Ins& Charging Handle _______~___..____..._~_~___~_______~____~...-----___~~~_~____~____5Remove/Inst all Bolt Carr ier, Guide Rods and Guide Rod

3 - 113 - 123 - 133 - 143 - 153 - 163-173 - 183 - 193 - 20123

Springs .__._.____._______________..~.__~~.___~_____.._.______________________~_________________________.__________._.3 - 5Remove./lns~ll Upper Hand Guard ______________________________________._..._______~________35Remove/Ins~ll Firing Pin Retaining Pin _____________________________._..._.~______________~36Remove/In st all Fir ing Pin Reta inin g P in __._____________________________.____.__________.._...______- 6Remove/Inst all Firin g Pin ___________________________________..~_____._____._~_____________________________-._----- 6Remove/In st all Bolt Cam Pin __.__.._____________________________________~______.___.________________________-.3 - 6Remove/Inst all Extr actor (a) Bolt Assembly (b) ____________________________________ - 6Bolt Carrier Group Parts ___...__.__..__..... __...___._._________._.______________________________________-.-...38Disengage/Engage Receiver Pivot Pin ._________.._.____._________________ __._____________.__--.____-- 8Disassemble/Assemble Magazine __________.______.__._..______._._..._..____~_.__________ _____ _____._._.____- 8Cleaning & Lubricating Bolt Carrier Group ~._.__.___.~..______.__________.____~~___~~______....~~_.8Upper Receiver Group .______._ __.___.._ ________________.__________________________.____.____..__________----------- 2Bolt Carrier Group _________________~______________________________._________.____._._._._._._.._......__-._..-.--- 4 - 4Lower Receiver Group ____.___.____________________________._.____..____..__ ___..._..._________.__________________- 6

LIST OF TAB LESNumber Title Pagel-l Accessories _________________________.____.__. .___.._._________________________.._____._.___. ________.____.__________- 2l-2 Special Tools ____.___.__ ._.____________________________..________._..~____._____.__.________________.. ._l - 33-l Trouble Shooting __ ____ ___..___________.___________.~_____...__..____.___...______________________.________..3 - 33-2 Pr event ive Main tena nce & Ser vices, Oper at or __________.______._____...._._._._._._.........___~__~_393-3 Preventive Maintenance & Ser vices, Orga nizat ion ________._____________.______.___________ ___- 93-4 Inspection ____..____.____.________________________..___________________..____________________________________________ - 10

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Rfle 5 56 m.m. - AR- I8hgure l-1

Rfle 5.56 m.m. AR-i 8 Stoc k Fold edFgure l-2

. . .111


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CHAPTER I

Section Il-1. GENERAL.1-2. SCOPE. This manual is published for the information and guidance of personnel respon-sible for operation and organizational maintenance of the Rifle, 5.56 MM, AR-l& Informationprovided includes : tabulated data, accessories and special tools, preparation for use, operatinginstructions, preventive maintenance and lubrication procedures, inspection, trouble-shooting,repair parts, procedures on disassembly, cleaning, repair, assembly and ammunition.

l-3. DESCRIPTION AND DATA.Section 2

l-4. DESCRIPTION. The AR-18 rifle, (Figure l-l), is light-weight, air-cooled, gas-operat-ed, magazine-fed, shoulder or hip fired, and designed for either full automatic or semi-auto-matic fire. The rifle utilizes a 20-round magazine.l-5. The manufacturers name, serial number and caliber is stamped on the left side of theupper receiver.l-6. The barrel is air-cooled and is provided with a flash suppressor and recoil compensator,which serves as a grenade launcher and front support for the bayonet. The barrel is surroundedby a heat resisting fiberglass material, which series as a hand guard and forearm. The handguard has a heat resisting metal inner shield. The front sight is adjustable for elevation and therear sight for windage.l-7. The rifle has a folding buttstock. (Figure l-2). The buttstock is made of a durable, syn-thetic material of high impact strength unaffected by exposure.l-8. The rifle is readily opened by pressing the guide spring plate forward, providing readyaccess for removal of the bolt carrier assembly and upper hand guard. Also accessibility to allother working parts for convenient cleaning and inspection. If ever required, the manual charg-ing handle provides a means of forcing the bolt forward to full lock position.1-9. The bolt incorporates seven locking lugs. Upon closing, the bolt rotates to engage Sevensilmilar locking lugs in the barrel extension. Thus, the full force of the explosion of the car-tridge is absorbed by the barrel extension and bolt. No pressure is exerted upon the receiver.The receiver is made of light-weight steel stampings. The design contributes to a high degreeof safety, durability and performance of the rifle. Portability and logistical value is greatlyincreased due to resultant weight saving.

Section 3l-10. TABULATED DATA.l-11. Tabulated data pertaining to the general characteristics and performance are listed asfollows :Weight

AR-18 Rifle without magazine and sling................__~_____~_._____~._~______________________._..___~__~_____b.Sling Ml ____ ._________________.._._._._..___________________._~_.____~_____~~______________~________~______.______________4 lb.Empty Aluminum magazine..___ .._.__________________.____ _____________._________________________________________ .2 lb.Loaded Aluminum magazine_._._._._...~_____________._.__.._____.._______._______._~______________~___~________7 lb.AR-18 Rifle with sling and loaded magazine........_._...._..___~________~____~___________________~____~~_______b.Biped M-3 _ .-----------_________________________________________._..._________.____.__.__________________________~_______6 lb.Biped Case ------------ ___._________________________________________.______________________~_____~_______~___________________2 lb.Bayonet-Knife M7 _________________________________________.________._.___~~_____~~______________________________________6 lb.Scabbard MU1 --____________________________________________..______~~_____~~________________________________________ ____3 lb.

l-l


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LengthRifle with flash suppressor-compensator.. _______._._ _... ._....__.._... .._._. ._._._... ......... 38 in.. ... . ...Rifle with bayonet-knife........__.._._.._____.____...__..._ in.. ._ ... . . _. ._......_..._...__... __.._.... ..__........... 43.5Barrel ._.___._______..___.__ ....... ..__.............................._ ................... 18 in... .... .. .. . _.___._______________._._..__.Barrel with flash suppressor___ . ..... ..__...._. .__ .__.__................ 19.8 in .... .. ... ._... . ........ ......... . ....... . _

Mechanical FeaturesRifling, R.H. 6 grooves - 1 tu rn in 12Bore Maximum................____~~~_._._~____._.__.__ .2190... _.. . _...... . ....... ... __..____......_.._.._.__....._.........

Groove Maximum_............~____.~__.______.__~._._.._ ..................... .2235. ._.... .... . .... . ... _... ._ ..___....._. ._._Sight Radius ........... 19.5 in.______.._______________________________........ . .... . ............. _....... . ......... .._..... . ... .Trigger pullMaximum 8.5 lbs..._ ..__.................. . _.. ..... . ............. . ... _. ._... .. _ _.___________..__.... . ______.___________.Minimum ............. 5.0 lbs.... .... ... ..... . __.__. .__..........____..__....._... . _.... . ____..__________ _______._________Method of ~peration...........____.~___._~_._____.._~. ....-Gas... .._. .. .. _ . ... . _ ___._.........._.....__.................._Type of Mechanism...._......__._._.~___.~~~~_____~__ Bolt... . . .._ _ ..__.._. __.____.___.___._........__..._....--Rotat in gMethod of Feeding - Magazine ................... 20 rds.. . .. ____________.___.._.._._ .___._.___._. __......__.___.._._Cooling .......... Air._______________________._____.___... _ ... _.____.____. . . ... . ... ..... __.___.. ____._______._..._..._...._AmmunitionCaliber ....... 5.56-mm_... . __.... _.____________.__.___________________________..___.____._______.._...._..._.............___.-_....-.Type Ball, Tra cer & Grena de Launching (Blank)_________..__.___~.._______..____.___________ ___.______....._.

Firing CharacteristicsMuzzle Velocity (Average)_...................___.___ ____ 3250 fps...................... ~_.__ ...... . _. ._ .__........_..__Muzzle Energy........_..._...__..__________.__.._._._._._.~.~___________: _.._ .__._.__________._._.__.-___-_......... 1300 ft-lb.Chamber Pressure .... .._..___._.__._...........________.____.___.____________. . ..__...__. ._...._..._ ..__ 52,000 psi... . .Clylic Rate of F~r~.____...._....___________~_..______._~____._.__.____._ ... _... ............. 700/80~ rds. per minuteMaximum Rate of FireSemiautomatic ___.__._..._______..._..___~___~~__~_.~..__. minute.._..______ ..._.........___.......... 45/65 rds. pe r

Automat ic _________________________________________~____~_~.____._..... . .......................... 150/200 rds. per minu teSustained Rate of Fire._......._...._.___~_________~_____...... . __ ._..........._............. 12/15 rds. per minuteMaximum Range.__~...........~___~___.__________.________~.___.._.._...__.____..........._._._.-_......--_ .-- .-.--2653 metersMaximum Effective Range_...._.........___.__._.__ ______.______.___._......_._. ._____-._---.--....... ...46 0 meters. ... . .

Table l-l. ACCESSORIES

Item IdFut;f;;pg Figure Nunlbel

Bayonet-Knife AR- 18 2862 l-3Bipod, Rifle AR- 18 2773.5 1-3Case, Bipod 2864 l-3Scabbard, Bayonet-Knife AR- 18 2863 l-3

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Item

Table 1-2. SPE CIAL TOOLS

IdentifyingNumber Figure Number

Rod, cleaning, small arms, AR-18 2866 1-YRr ush, cleaning, small arms 2867 1-3

Section 4

-l. ACCESSORlES AKD SPE CIAL TOOLS.Accessories ar e t abula ted in Table l-1 and listed in Apendix I, which is th e au th ority for

-15. Special Tools.16. Special Tools ar e t abula ted in Table 1-Z and listed in Appendix I, which is th e aut hor-for requisit ioning replacement s.

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Bayonet-Knife AR-18 and Bayonet-Scabbar d, Bayonet -Knife AR-18

BRUSH AND SWAB SECTION TOTALLED ON SMALL RODS BEFORE INSERTON

Bipod Case - 2864

Sma ll Arms Clea ning Rod - 2866

l-

Rfle Bipod, AR-18 5773-5

I 1 I I j- 2INCHES

Sma ll Arms Clea ning Brush - 2867

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CHAPTER IIOPERATING INSTRUCTIONS

Section I2-1. SERIICE UPON RECEIPT OF MATERIAL.-2. GENERAL.2-3. Upon receipt of the rifle, it \vill be inspected by the responsible individual to determinethat it has not been damaged in-transit and is in proper condition for service.2-4. All basic issue items, replacement parts, tools, and equipment checked as invoiced.2-5. A record will be made of all missing parts, tools, and equipment and any other deficienciesin the shipment. Corrective action will be initiated by the responsible individual.2-6. SERVICES.2-7. The rifle will be unpacked, all foreign matter removed from the surfaces of the weapon,assuring all components are clean. If necessary, the bore will be wiped clean by pushing clean,dry patches through the barrel, from the chamber to the muzzle.

The rifle will be visually inspected for function to include proper seating of the magazine.-9. BIPOD.2-l 0. Foreign matter will be removed from the biped and case, as necessary.2-11. The bipod will be attached to the rifle to assure that the bipod is undamaged, suitablefor use.

Section 2Z-12. CONTROLS.2-13. Refer to (Figure 2-l) for Controls and Operation of Controls.

Remov e Magozlne Fgure 2-l Clearing Rfle, inspect Chamber

Pa ce Selec tor Lever in Safe Posit07


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Section 32-14. OPERATION UNDER USUAL CONDITIONS.2-15. GENERAL. 2-16. PREPARATION FOR FIRING. Clear the rifle by performing the following operations :Remove magazine, inspect chamber and place selector lever on safe position. (Fig. 2-l.)2-17. SERVICE BEFORE FIRING. Refer to T es 3-2 and 3-3.2-18. CLEAN AND LUBRICATE THE BOLT CARRIER GROITP. The bolt carrier groupmay be removed, as shown in (Figure 3-10.) Remove any oil or dirt from the external surfacesof the bolt and bolt carrier with a clean, dry rag or cleaning patches. Place a drop of oil in eachof the two holes of the bolt carrier to lubricate ,the guide rods and a drop on the body of the bolt.Use oil sparingly, as excess oil may collect foreign matter. Wipe any excess oil from the surfaceof the bolt carrier. A light film of grease or oil may be applied to the guide rail for the bolt car-rier on the left inside of the upper receiver.2-19. LOADING. Note : Repeat Operation in (Figure 2-l). (Safety Procedure).2-20. LOADING THE MAGAZINE. The magazine has a capacity of 20 rounds and may beloaded with any amount up to that capacity. The magazine follower has a raised portion gener-ally resembling the outline of a cartridge. Cartridges are loaded into the magazine so that thetips of the bullets point in the same direction as the raised portion of the follower.

Rea r Sght AdtustmentFigu re 2-3

2-21. LOADING THE RIFLE. The magazine may be inserted with the bolt and the bolt carrieropen or closed. Hold the forearm of the rifle with the left hand, pointing the muzzle in a safedirection. With the right hand, insert a loaded magazine into the magazine housing. Push up-wards until the magazine gauge engages and holds the magazine. Rap base of magazine sharplywith heel of hand to assure positive retention. Check by attempting to withdraw the magazinewithout use of the magazine release. If the action is open, grasp the charging handle with theright hand, pull to the rear, thus disengaging .the bolt stop and release the charging handle. Around will be stripped from the magazine and loaded into the chamber. If the action is closedwhen the magazine is inserted, pull the charging handle fully to the rear with the right handand release it. NOTE: Do not ride the charging handle forward. If the charging handle iseased forward from the open position, the bolt may fail to rotate and fully lock. If the bolt failsto go all the way forward, push forward on the manual charging handle.The rifle is now loaded, ready to fire.

WARNINGMake sure the selector lever is on thesafe position, if not ready to fire.

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Remove M oga zlne Figure 2-4 Inspect Chamber

Disengage Takedown Remove Bolt Handle

I_))d II. FIRING.Z-23. SEI,ECTOR LE1ER. The rifle may be fired semi-automatically or fully automaticallyby moving the selector lever to the appropriate position, described in Figures 2-l and 2-5.:-23. SE111 POSITION. With the selector lever in this position, the rifle will fire one roundeach time the trigger is pulled.Z-25. AUTO POSITION. With the selector lever in this position, the rifle will continue to fireuntil the magazine is empty or the trigger is released. When the rifle is fired on either SEMIor AliTO, the bolt will lock in open position when the last round from a magazine has been fired.Z-26. WITH STOCK FOLDED. With the stock folded, the rifle may be fired and readily con-trolled from the hip position. The selector lever must be positioned from the right side of therifle, as the folded stock prevents access to the lever on the left side. See Figure 2-5._7. IMMEDIATE ACTION PROCEDURES FOR REMOVING A LIVE ROUND IN CASEOF FAILURE TO FIRE.2-28. To apply immediate action, follow the sequence below:

a. Wait 10 seconds, then pull charging handle fully to the rear; observe for ejection ofcartridge or cartridge case.1. If a cartridge is ejected, release charging handle to feed a new round.

2. If a cartridge or case is not ejected, a failure to extract or feed has occurred.Check for round in chamber. If chamber is empty, change magazines, reload andattempt to fire the rifle.

b. If a. 1 above occurs, it may indicate a defective round, a broken firing pin, hammeispring or a bolt closure failure.

c. If a . 2 above occurs, it may indicate a broken eutractor.2-29. MISFIRE, HANG FIRE AND COOK-OFF. In the event of failure of the rifle to firewhen the trigger has been pulled and the hammer has fallen, allow ten seconds to elapse in theevent of a hang fire and then eject the round and attempt to fire. Cook-off can only result froman excessively heated chamber, caused by full automatic fire requiring approximately 180-200

2 -3


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Fgure 2-4 Remove Bolt Assembly , Guide Rods and Sprlrlgs

~rle 5.56 m .m., A R-I 8, Soc k Folded ,nJump PosittonFgure 2 -6A

Fgure 2-5 Selector Lever Operation with Sock folded

rounds fired in a very minimu m period oftim e. A cook-off can resu lt when t he prim-er is exposed t o extremely high tem pera -ture, but still will require approximately30 seconds for t he heat to ignite the primer.In th e event a cook-off occurs , imm ediat elyremove the magazine and eject the cham-bered cart ridge. Under all above conditions,be par ticularly car eful as to th e directionthe rifle is pointed.2-30. DOUBLE F EE D. Double feed ma yoccur when initially loading the rifle,caused by failure to allow the first round tofully chamber and pulling the charginghandle to the rear with the first cartridgestill held by th e extr actor. The bolt carr ier,going forwar d, will at tem pt t o str ip th esecond round from th e magazine, result ingin a jamm ed condition. Remove t he maga-zine and pu ll th e cha rging han dle to therear , releasing th e first car tr idge.2-31. UNLOADING. Repeat opera tion infigure 2-l and 2-16.2-32. INSTALLING ACCESSORIES,figures 2-8 and 2-9.

2-4Rfle 5.56 m.m ., AR-l 8, Soc k Extended I

Jump PositionFgure 2-68


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Section 42-33. OPERATION UNDER UNTJSUALCO;\;DITIONS. If it is desired to fire therifle \vith the stock folded, the tiser shouldbecome fully familiar with the operationof the selector lever from the right side ofthe rifle. The forefinger of the right handshoultl be 11s~~ o allo\v the continued prop-er hold on the pistol grip (a left handedshooter \vould use the thumb of the lefthand).-34. The rifle may be attached to theuser for jump purposes, with stock foldedor fully extended. See figure 2-6.2-X. The rifle should be held whenlaunching grenades from a hip position,muzzle elevated, utilizing the sling. See fig-ure 2-7.

NOTEThe rifle should never be firedfrom the shoulder when launch-ing a grenade.

Remove, Install Bayonet-KnifeFgure 2-e

Launching GrenadeFgure 2-7

Remov e/ Install BipodFgure 2-9

2-5


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Section 52-36. TELE SCOP IC SIGH T. Fig. N o. 2-10. The teles copic sight is one of extr emely du ra bledesign with out sta nding optical capabilities. It ha s a tr ue 2.75X magnificat ion.2-37. The quick deta chable moun t allows imm ediat e rem oval or inst allat ion. Regardless of th enu mber of times r emoved, it will ret ur n to a positive zero due to th e dove tail design of th e baseand mount. A tunnel over the sight allows use of the iron sight in case of such an immediate re-quirement.2-38 A range knob on top of the sight has 4 settings - 1 for l-200 yar ds; 1 each for 300, 400an d 500 yards. Th is ra pid an d positive elevation system cont ribut es great ly to pra ctical use inth e field. The pr otective cap on th e top of the ran ge a djustm ent knob is rem oved by th e use ofthe head of a cart ridge. Sight elevation adjustmen ts are made under this cap by rotating theelevat ion knob with th e head of a cart ridge in th e dir ection of t he arr ow to move th e point ofimpact up.2-39. Dust covers are provided and t hey should be used at all times when t he sight is not in-stalled on t he rifle or intended for immediate use to protect the lens.2-40. INSTALLATION. The sight is inst alled by compr essing th e safety lever on ihe front ofth e mount allowing it to clear th e dove ta il base on th e rifle. The plu nger at t he r ear of t hemount is pressed firm ly against the front base of the rear sight, compr essing the spring al-lowing th e scope mount to slide forewar d on th e base.2-41. The sight incorpora tes an inverted post as well as fine crossha irs. When holdingover at extrem e ra nges, th is precludes th e post from blott ing out the tar get. This compa ra -tively heavy post allows positive point of aim in tim es of nea r dar kn ess when th e fine crosshairs tend to disappear against the background. .2-42. MAINTENANCE.

1. Use lens cover at all tim es when th e sight is not in use on the rifle.2. Check periodically to assu re all caps and screws ar e snu g an d in place.3. Oil th e sprin g plun gers lightly.4. Oil th e base occasiona lly t o facilitat e m ountin g an d to prevent ru sting.

Figure 2-l 0

2 -6


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CHAPTER IIIORGANIZATIONAL MAINTENANCE

Section I3- 1. REPAIR PARTS, TOOLS AND EQUIPMENT.3-2. GENERAL.

INSTRUCTIONS

*, ,3-t>. This chapter lists repair parts, common t!)ols and equipment and special tools and equip-ment.3-4. REPAIR PARTS (2nd Echelon)

PART NO. DESCRIPTON OUANTTY2666-A Extractor 292671-C Firing Pin 32673-B Take Down Pin, Bolt 32668-A Spring, Extractor 292715-C Spring, Firing Pin 32678-A Spring, Operating Rod 2

3-9. ACCESSORIES AND SPECIAL TOOLS. Accessories and Special Tools are tabulated inTable 3-4.

Section 23-6. LUBRlCATION.3-i. GENERAL. The rifle should be cleaned and lubricated at the end of each days use, orwhen exposed to an excessive amount of dirt, gIn i t , o r other foreign matter and//or water. Therifle should not generally be fired beyond 200 rounds without being cleaned, although, undernormal condition:;, the rifle can be expected to perform reliably up to approximately 1,000rounds without cleaning. For best continued operation, all surfaces should be protected by avery light film of oil, except under sub-zero temperatures all oil should be removed from mov-ing components. The rifle can function completely dry, although lack of lubricant is undesir-able, due to resultant excessive wear. NOTE : Keep the gas piston clear of excess oil to preventearl\- formation of carbon.3-8. CLEANING AND LUBRICATION AFTER FIRING.3-9. CLEAKISG AND LUBRICATING THE BARREL.

a. Attach the wire brush to the Cleaning rod, dip in solvent cleaning compound and brushthe bore thoroughly. Do not submerge barrel in cleaning solution. The gas piston should not beallowed to fill with oil. Brush the bore from chamber to muzzle, using straight-through strokes.

NOTEDo not reverse direction of brushwhile in bore.

Push the brush through the bore until it extends beyond the muzzle. Continue until the bore iswell covered with solvent. Remove the brush from the rod, and dry the bore by pushing throughclean, dry patches. Continue until patches come out clean and dry.

b. Clean the locking lugs in the barrel extension, just to the rear of the chamber. Brushthe lugs with a small brush.

c. After cleaning, lubricate the bore with a lightly oiled patch to prevent corrosion andpitting. Lightly oil the lugs in the barrel extension.

d. Remove the individual component parts of the operating rod. Wipe clean with oil-soaked patches. Use the cleaning rod with the brush to clean the gas piston. Remove any excessoil. See Figure 2-6.

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3-10. CLEANIN G AND LUBRICATIN G THE BOLT CARRIER GROUP .a. Remove the bolt car rier group from th e upper receiver. Field st rip t he bolt carr ier

group. Wash all extern al sur faces with a pat ch sat ur at ed in solvent clean ing compoun d.b. Using a small bru sh dipped in solvent cleaning compound, scrub a ll car bon depositsand dirt from the locking lugs of the bolt.

CAUTIONBrush the face of the bolt, paying par-ticular attention to area under theface of extra ctor. Do not att empt toremove discoloration caused by heat.

When dry, lightly oil th e sur face of th e bolt car rier and place one dr op on th e bolt body. Seefigure 3-20.3-11. CLEANING AND LUBRICATING THE LOWER RECEIVER GROTJP .

a. Wipe any par ticles of dirt from th e tr igger mechan ism with a clean pa tch or brush .b. Place a drop of oil on each of the pins and the stock hinge and release plungers.

Section 3 J

3-12. PRE VENTIVE MAINTENANCE SERVICES.3-13. GENERAL.3-14. RESP ONSIBILITY. It is th e responsibility of th e operator to assu re his rifle is properlylubricated at all tim es an d is in proper functioning order. If the rifle appear s to not be function-ing norma lly, it will be report ed to th e responsible organizational personnel. (Table 3-l) . Itwill be th e responsibility of organizational ma inten an ce personnel t o ma ke minor repa irs, a sindicated in Table 3-3..3-15. GENERAL. *3-16. GENE RAL PROCEDURE S. Organ izational ma inten an ce personnel will be responsiblefor th e care and preventive ma inten an ce of th e rifle when in tem porar y st orage an d/or un der-going r outine ins pection. Th ese personnel a re responsible for assu ra nce t ha t the rifle is beingproperly m aint ained by th e operator an d only re-issued when in proper mechan ical condition.Evidence of componen t failur e or wear will be report ed to higher a ut hority, consist ent withstan dard operating instru ctions.

Section 4

3-14. TROUBLESHOOTING.3-15. SCOPE. The following inform at ion is to assist th e opera tor and organ izationa l ma inte-na nce personnel to restore inoperat ive or worn , or dam aged equipmen t to a sat isfactory oper-at ing condition. This includes both det erm inat ion of th e cau se (tr ouble sh ooting) an d correc-tive action. All repa ir ma inten an ce in dicat ed sha ll be perform ed only by qualified personnelutilizing standard service equipment. Table 3-l.

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Table 3-l. TROUBLE SHOOTING

Malfunction Pr obable Cause Remedy

Bolt fails to lock to the rear afterlast round.Failure to feed.

Fa ilure to fire.

Fires with selector lever on SAFE.

With selector lever on SEMI, fireswhen tr igger is released.

Bolt seizes, will not rotate.

1.

1.2.

1.

2.3.1.2.1.2.1.

Fau lty magazine. Replace magazine.

Faulty magazine.Binding bolt and bolt carrier inlocked position.

Improper assembly of firing pin.

Impr operly installed hamm er ortrigger spring.Obstructed chamber.Faulty selector lever.Fau lty or misalined tr igger pin.Fau lty or misalined trigger pin.Faulty hamm er or trigger.Carbon dirty or burred boltgroup.

Replace magazine.Disassemble and clean (on a newweapon, one or two drops of oil onthe guide rods may remedy thistrouble).Check firing pin and spring an doil. Clean and lubricate bolt andcarrier, higher echelon.Reinsta ll firing pin an d check bolttakedown pin for damage. Alsocheck spring and replace if broken.Disassemble a nd insta ll properly.Clean.Higher echelon. .Replace trigger pin.Notify higher echelon.Notify higher echelon.Hold rifle in vert ical position andstrike butt sharply on ground whilepushing down on charging han dle.Clean as necessary.

Sect ion 53-16. MAINTE NANCE OF RIFLE .3-17. DISASSEMBLY/ASSEMBLY. This section cont ains inst ru ction on disassem bly, assem -bly and maint enan ce, before an d a fter firing. F or disassem bly and assem bly inst ru ctions, seefigures 3-l thru 3-19.

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Bolt Car1

Upper Receiver Group

Lower Receiver Group

\\ - Hnmmer Spring

R,fle, 5.56 m.m. A R-I 8 Major Groupshgure 3-l

Remo ve, Install Ooerat~na Rod Assemb lvFgure 3-2 D,sengog eiRemove Srlect or LeverFgure 3 5A

Selector lever 6-3-,ght Sde \

PIIT a ndare

able

Remo ve/ Install Hamme r PnFgure 3-3 3-4

D!sengo ge/ Remov e Selecto r LevelFtgure 3.58


20/32

Remove / Insta ll Tr,gger PIFqure 3-6

Trigger P nI

Rem ove / Install Trigge rFgure 3-7

Second Sep Push Forward +o op en or tolock upon closmq

Dlsenga gelEngoge Tokedow nFgure 3-8

Charging Hondle

Withdraw/ insert Chorg mg Handle

Chorgmg Handle

Remove / lns?oll Bolt Cotrwr, Guide Rod sand Guide Rod Springs

Fgure 3-10

Remo ve/ lnstoJl Upper Hand GuardFgure 3-l 1

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Remov e/ lnstoll F!rlng Pn Reta ining PnFgure 3.12 Remove /lnstoJl Bolt Corn Pn and BoltFgure 3-15

Rem ove /Install Fring Pn Reto tnrng PnFgure 3-13 Remove / Install Extractor

Fgure 3-160

Insert large end oftention

Eector

Remov e/ lnstoll Fring PnFgure 3.14

3 -6Bolt AssemblyFgure 3-l 6b


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3-18. CLEANING, INSPECTION3-19. BEFORE FIRING. The rifle2-14.3-20. AFTER FIRING.

AND REPAIR.should be inspected as indicated in Section 3, Chapter II,

a. Cleaning after Firing: Table 3-2 and 3-3.b. Inspection after Firing: Table 3-4.

3-21. REPLACEMENT OF PARTS.3-22. All replacement parts are interchangeable and require no adjustments when being in-stalled in this rifle. However, to insure proper function and full reliability, the following pre-cautions should be taken :

a. Do not interchange bolts, bolt carrier; and barrels. Keep the bolt carrier assemblyv:ith its original barrel to assure retention of cxrect headspace.

b. If replacement of either part becomes necessary, carefully check the new part to seethat it fits properly and operates smoothly.3-23. FUNCTION CHECK.

NOTERemove Magazine

3-24. A complete function check of the rifle consists of checking the operation of the rifle whilethe selector lever is in the SAFE, SEMI, and AUTO positions. The following sequence is usedfor a rapid, complete check. Any portion of the check may be used alone to determine the oper-ational condition of any specific fire selection. Start with the upper and lower receiver groupsin the open position.

NOTEReceiver is in open position

a. SAFE position. Cock hammer and pull trigger. Hammer should not fall.b. SEMI position. Pull trigger. The hammer should fall. Hold trigger to rear, recock

hammer and release trigger. Hammer should transfer from disconnect to the hammer and searengagement.

NOTEReceiver is in closed position

c. AUTO position. Pull trigger, hammer should fall. Hold trigger to the rear and operatecharging handle, recocking the hammer. Release charging handle. The hammer should fall. Re-lease trigger and operate charging handle, cocking hammer. Release charging handle. Ham-mer should not fall. For further safety check, while cocked with safety on, rap butt on floor.If hammer falls, turn in for repair.

d. SEMI position. Pull the charging handle to the rear. Inspect the chamber for safetyand release charging handle. Pull the trigger. Hammer should fall.

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Bolt Carrier

Bolt Corn PnRetaining Pn

Bolt Corner Group Parts Disassemb le/ Assemb le Mog ozlneFgure 3-17 Fgure 3.19b

Disengage /Engage Rece ivmg Pivot PnFgure 3.1 8

\ One drop of 011

.

Cleaning and Lubrlcotlng the Bolt Carrler G roupFgure 3-20

Disassemb le/ Assemb le Mag azineFgure 3-l 90

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Table 3-2.PREVENTIVE MAINTENANCE SERVICES

Int erval & Sequen ce No. rBefore During AfterFiring Firing Firing

5

OperatorItem to beInspected

BarrelAssemblyBolt As-sembly &BarrelRifle

Lower Re-ceiver &MagazineBarrel,Barrel Ex-tension,Bolt CarrierAssembly

Procedures

Wipe oil from bore and chamber.

Retra ct bolt to assu re free move-ment between bolt carrier and re-ceiver.Hand function to assure properoperation.Check magazine for positive ret en-tion and functioning of bolt catch.

Clean and lubricate. Part icular at-tention to clean bolt carrier andbolt assembly.

Daily ScheduleParagraphReferences

Table 3-3.PREVENTIVE MAINTENANCE SERVICES

OrganizationalMaintenanceSequence No. . Personnel Weekly Schedule

Item to beInspected Procedures ParagraphReferences

1 Barr el & Bolt Inspect for adequa te an d not exces-Assembly sive lubrication.

2 Rifle Hand fun&ion to assure propeloperation.*3 Lower Receiver Cheek maga iznc for positive ret en-Bt Magazine tion & functioning of bolt catch.*4 Bolt Assembly Inspect extra ctor for cracks. Checkextractor spring for proper ten-

sion.*5 Barrel, Bolt Inspect for cleanliness & Lubrica-Assembly, Guid.c tion.*Rods, Lower Re-

ceiver, Operat- *Prior to issue.ing Rodr

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Table 3-4.

INSPECTION

Part , Components or Area Instructions

Barrel and Barrel Extension Inspect sur faces for cracks or defects.Check barr el extens ion for burr s, br oken or worn locking lugs.Inspect bore for damage.

Front Sight & Operating Rod. Check front sight an d operatin g rod for cra cks and general condition.Upper & Lower Receiver Gr oups. Inspect the receivers and all parts for cracks.

Inspect all parts for wear or damage.Check springs for condit ion, st raight ness and tension.

Bolt and Bolt Carrier. Check for cracks in bolt.Inspect bolt for condition of locking lugs, pitted or chipped bolt face,and elongated firing pin hole.Inspect firing pin for wear a nd burr s.Inspect bolt carrier for cracks, burrs and chips.Check socket head cap screws for being staked.

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APPENDIX IB/+SlC ISSUE ITEMS LISTSection I

l-l. PREF ACE. This appendix list th e basic issue item s, tools, equ ipment an d r eplacementparts for rifle, 5.56 mm, AR-H.Section 2I-. BASIC ISSUE ITEMS. The group listings ar e a break down of equipment by a physicaldescription supported by illustrations.(Figures l-2-3 exploded views).

l-3. MAJOR ITEMS.GROUP ASSEMBLY PARTS LIST

c-03 15-Day Maint.2 Allow Per

g g 0I!! e .%

106 EquipmentoEP zs 7

x Manufacture1 % -: A.5Stock Description .$ .s g_2 No. =,z fz z 2._ @ Ea 0

UPPER RECEIVER GROUPlA* 2632 Assy, Weld & Rivet, Upp er Receiver2 * 2631 Receiver, Upper 13 * 2680 Housing, Rear Sight 14 * 2580 Extension, Barrel 15 * 2674 Guide Track, Upper Receiver 16 2589 Rivet, Auto Sear 1 17 * 2840 Lug, Front, Dust Cover 18 * 2841 Lug, Rear, Dust Cover 19 * 2785 Plate, Scope Mount 1

LOA 2679 Assy, Barrel To Upper Receiver 111 * 2632 Upp er Receiver Weld & Rivet Assy. 112 * 2626 Barrel 1 113A* 2856 Assy, Front Sight 114 * 2634 Front Sight (Factory or Ordna nceInstallation Only) 1 (1.0)15 2776 Swivel Sling, Front Sight 1 1L6A 2857 Assy, Piston Front Sight17 2643 1_. Piston, Front Sight 118 2763 Ring, Piston 3 319 2635 Blade, Front Sight 1 120 2636 Plunger, Front Sight 1 121 2677 Spring, Plunger, Front Sight 1 122 2637 Taper Pin, Front Sight 2 223A 2855 Assy, Dust Cover 124A 2845 Weld Assy, Dust Cover 1 125 * 2837 Cover, Dust 126 * 2842 Cam Follower, Dust Cover 127 2844 Spring, Plu nger, Du st Cover 1 128 2843 Plun ger, Cam Follower, Dust Cover 1 129 2780-l Roll Pin 1 130 2838 Spring, Hinge Pin, Dust Cover 1 1* Indicates par t of an assy. not to be order ed separa tely.

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a

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GROUP ASSEMBLY PARTS LIST-

ManufacturerStockNo.

Description

-283927172629266321792716263026642779264126782639284627752644270327342587265426552656267526592685267626822681268327912853-l

Hinge Pin, Dust Cover 1Assy, Upper Hand Guard 1Hand Guard UpperLiner, Upper Hand GuardDrive Screw 8

Assy, Lower Hand Guard 1Hand Guard, LowerLiner, Hand Guard, UpperDrive Screw 8

Operating Rod 1Spring, Operating Rod 1Link, Operating Rod 1Cylinder, Operating Rod 1Nut, Recoil Compensator 1Recoil, Compensator 1Cap, Hand Guard 1Assy, Auto Sear

Rivet Assy, Auto SearSear, Automatic 1Extension, Auto Sear 1Pivot Pin, Sear Extension 1Bushing, Auto Sear 1Spring, Auto Sear 1

Pivot Pin, Auto Sear 1Drum, Windage, Rear Sight 1Spring, Rear Sight 1Spring, Flat, Rear Sight 1Aperature, Rear Sight 1Screw, Windage Rear Sight 1Protector, Rear Sight Screw 1Snap Ring, Rear Sight 1_._ BOLT GROUP

2705 Assy, Bolt Carrier2646 Carrier, Bolt2684 Pin, Press Fit, Bolt Carrier

1

2671271526732590283625942835

Firing, PinSpring, Firing PinTake Down Pin, BoltPin, CamAssy, Charging Handle

Handle, ChargingKey, Char ging H and le

2667 Pin, Extractor2668 Spring, Extractor2666 Extractor2780-3 Roll Pin, Ejector2669 Ejector2670 Spring, Ejector2665 RI-&

1111111-

11181181111111

1111111111111

111111111111111-

-

-z.$d2CJ6-

(1.0

(1.0(1.0(1.0

(1.0(1.0

-

15-Day Maint.Allow Per100 Equipment

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4-4


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GROUP ASSEMBLY PARTS LIST

78Ai!)8081828384

266226602661276427652780-I

85A8687A8389909192939495A9697

2628268728582G4526232772-I262727822658260427532544 RC 5133-152746

98A 270899A 28590 26141 277X-2 RC 5133-183 2772-44 772-3

X72-66 2852-128608 26189 26210 277427522 27603 27544 2620

57 :

4

2854-l2861 RC 5133-1526172696272326222780-2. 094-0562267276125862609

ManufacturerStock

No. Description

Assy, Stake, Guide RodForging, Plat e, Guide RodsGuide Rod

Plunger, Guide Rod PlateSpring, Plunger, Guide Rod PlateRoll Pin, Plunger, Guide Rod PlateSpring, Action

LOWER RECEIVER GROUPAssy, Weld & Rivet, Lower Receive1

Rivet, Trigger Guar dWeld Assy, Trigger Guard

Trigger GuardNut, Pistol GripPost, Snap, FastenerReceiver, LowerBracket, Lower Receive)Bracket, Magazine LatchBushing, Bolt CatchWeld Assy, Bulkhead

Bulkhead, Receive1Plate, Bulkhead

.4ssy, ButtstockAssy, Fastener, Buttstock

ButtstockCover, Snap FastenerSpacer, Snap FastenerSpring, Snap FastenerPlate, Snap FastenerRivet, Snap FastenerWasher, Plain, Snap FastenerAssy, ButtcapButtcapRecoil PadScrew, Recoil Pad

Weld Assy, Hinge, ButtstockHinge, ButtstockNut, Buttstock Hinge

Screw, ButtstockSnap Ring, Hinge Pin, StockAssy, Pistol Grip

Pistol GripSling, Swivel, Pistol Grip

Washer, Plain, Pistol GripBolt, Pistol GripRoll Pin, Plunger, BulkheadSpring, Plunger, BulkheadPlunger, BulkheadHinge PinHammerSpring, Hammer

Is2+I0.%

s-i1112

11

1

21

111

11212111

-

2

11

11211111111212111-

15-Day Maint.Allow Per100 Equipment

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0-

0 Yl-;_ 0--_-d

*s---\N

aN

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GROUP ASSEMBLY PARTS LIST15-Day Maim.-0s Allow Per2 ? (d 100 Equipm ent, Manufacturer 8

P zStock Description ~ 2.3OF ;;i2 No. 0 2s .gz!

.z T.5 s.% .-z 32%iz $ POQ $6

7 2651 Snap Ring, Hammer, Triggel 2 28 2650 Pin, Hammer, Trigger 2 29 2610 Bushing, Hammer 1 10 607 Disconnect, Trigger 1 11 2695 Spring, Disconnect 1 12A 2712 Assy, Riveted, Trigger 13 * 2647 Trigger 14 * 2608 Assy Pin, Trigger 15 2652 Spring, Trigger 1 16 2694 Spacer, Trigger 1 17 2648 Bushing, Trigger 1 18 2781 Takedown Pin, U & L Receivers 1 19 2657 Latch, Magazine 1 10 2780-4 Roll Pin, Magazine Latch 1 11 2702 Spring, Magazine Latch 1 12 2780-2 Roll Pin, Bolt Catch 1 13 2603 Retainer, Spring, Bolt Catch 1 14A 2601 Weld Assy, Bolt Catch 15 * 2597 Bolt Catch 16 * 2599 Housing, P lunger, Bolt Cat ch 17 2602 Spring, Plunger, Bolt Catch 1 18 2600 Plunger, Bolt Catch 1 1 (9 2605 Pin, Bolt Catch 1 10 2854-4 Snap Ring, Bolt Catch 1 11 2854-l Snap Ring, Safety Lever 1 12 2768 Lever, Safety 1 1

53 2595 Casting, Safety 1 154 2701 Spring, Safety Detent 1 155 2598 Detent, Safety 1 1

ACCESSORIES!56 268858 286259 286360 2773-561 286462 286563 286664 286765 2868

Magazine Assy, 20-round (4.0)Bayonet-Knife, AR-18Scabbard, Bayonet-Knife, AR-18Bipod, AR-18Case, Bipod, AR-18Scope, 2.75 x 20mm with mount, AR-18 .Cleaning Rod, AR-18Bore Brush, Caliber. 22Sling, AR-18 (2.0:

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& Maintenance Manual