Bushmaster Xm15 Instruction Manual
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FRONT SIGHT DETENT 19 LU BR IC A TIO N - U pper R eceiv er… L ig htly lu bric ate th e in sid e o f u pper re ce iv e r, th e b ore a nd ch am ber (u sin g th e cle a nin g ro d a nd a p atc h ), th e o ute r s u rfa ce s o f b arre l a nd fr o n t s ig ht, a nd s u rfa ce s u nde r th e h and guard . B e s u re y o u lu be i n a nd a ro u nd a ll th e L ockin g L ugs ( s e e illu str a tio n a t r ig ht) . D epre ss th e F ro nt S ig ht D ete n t a nd a pply tw o o r th re e d ro ps o f C LP to it . D epre ss th e d ete nt s e ve ra I tim es to w ork th e lu bric a nt in to t h e s p rin g . L U BR IC A TIO N - L ow er R eceiv er… L ig htly lu bric ate in sid e th e Low er R ece iv e r E xte nsio n (B uffe r T ube), th e B uffe r a nd th e A ctio n S prin g. G en ero usly lu bric a te a ll m ovin g p arts in sid e th e L ow er R ece iv e r (tr ig ge r, h a m mer, s a fe ty , b o lt c a tc h , f o rw ard a ssis t, e tc ), a nd th eir v a rio u s p in s a nd dete nts . Dont fo rg et th e T ake dow n a nd P iv o t P in s a nd th eir d ete n ts . W ip e a ny fin gerp rin ts ( th ey c a n s ta rt th e c o rro sio n p ro ce ss) o ff t h e e xte rio r s u rfa ce s w it h a n o ile d r a g - a b la ck c lo th is b est a s it w ont l e ave v is ib le lin t. L U BR IC A TIO N - B olt C arrie r G ro up… Lig htly lu bric ate th e F ir in g P in w it h C LP - a ls o th e F ir in g P in r e ce ss in th e B olt . G en ero usly lu bric ate th e B olt , it s C am P in a re a, th e B olt G as R in g s. A lig h te r a pplic a tio n is g ood o n th e E xtr a cto r a n d it s P in . L ig htly lu bric ate th e C harg in g H andle a nd th e in ner a n d o u te r s u rfa ce s o f th e B olt C arrie r. G en ero usly lu bric ate th e s lid e a n d C am P in a re a o f th e B olt C arrie r. T he in sid e o f th e C arrie r K ey o n th e B olt C arrie r s h ould b e d rie d w it h a P ip e C le ane r - th en p la ce o ne d ro p o f C LP in sid e. 20
21 Note : R eco rd h ow fa r y o u m ove th e r e ar s ig ht s o it c a n b e r e tu rn ed to it s o rig in al p osit io n u pon t h e c o m ple tio n o f th is ta sk. R ear S ig ht 1.) E le va tio n k n ob 2.) E le va tio n s cre w s h aft 3 .) W in dage k n ob 4.) W in dage s cre w 5.) D ete nt h ole s E le vatio n S cre w S haft: A ls o lu be fr o m in sid e t h e u pper r e ce iv e r a s fo llo w s: 1 .) T urn u pper r e ce iv e r u psid e d ow n 2.) R em ove c h arg in g h andle 3 .) P ut 2 o r 3 d ro ps o n b otto m o f e le va tio n scre w sh aft and in e le va tio n d ete nt s p rin g h ole 4 .) R ota te th e e le va tio n d ia l b ack a n d fo rth a fe w tim es while k e e pin g up per re ce iv e r upsid e - d ow n LUBRICATION - Adjustable Rear Sight … WINDAGE KNOB ELEVATION KNOB WINDAGE SCREW BOTTOM OF ELEVATION SCREW SHAFT AND DETENT SPRING HOLE DETENT SPRING HOLE Note : E xtr a cto r A sse m bly h a s a R ubb er In se rt w it h in th e S prin g. B e s u re n ot to lo se it . If th e S prin g c o m es lo o se , p ut th e la rg e e nd o f t h e s p rin g in t h e e xtr a cto r a nd s e at it ( a b ulle t tip w ork s w ell) . 22 REASSEMBLY … 1.) Insert Action Spring and Buffer. Depress Buffer Detent. and push Buffer in past the Detent, then release. 2.) Insert Extractor and Spring. RUBBERINSERT
23 REASSEMBLY (continued)… 3.) Push in Extractor Pin. 4.) Slide Bolt into Carrier. STAGGER THE GAS RING GAPS TO REDUCE GAS LOSS. Position the three ring gaps 120 apart around the bolt. 24 REASSEMBLY (continued)… 5.) Replace Bolt Cam Pin. GIVE CAM PIN A 1/4 TURN AFTER INSERTION 6.) Drop in and seat the Firing Pin. FIRING PIN 7.) Pull Bolt out. WARNING: Be sure the Cam Pin is installed in the Bolt Group. If it isnt, your r\ ifle can still fire and will explode! NOTE: The Bolt is machined so as to allow insertion of the Cam Pin from one s\ ide only. This provision aligns the Extractor and Ejector properly within the Upper Rec\ eiver.
25 REASSEMBLY (continued)… 8.) Replace Firing Pin Retaining Pin. 9.) Engage, then push Charging Handle part way. 10.) Position Carrier Key in slotted bottom of Charging Handle. Slide in Bolt Carrier Group. NOTE: Firing Pin should not fall out when Bolt Carrier Group is turned upside down. CAUTION: Bushmaster does not recommend the practice of swapping bolts between different rifles. Doing so could result in damage, personal injury or de\ ath. 26 CAUTION: Selector Lever should be on SAFE before closing Upper Receiver. REASSEMBLY (continued) … 11.) Push Charging Handle and Bolt Carrier group into receiver together. 13.) Engage Receiver Pivot Pin. 12.) Join Upper and Lower Receivers.
28 MAGAZINE DISASSEMBLY / REASSEMBLY … 1.) Release Base Catch by prying up gently on the Magazine Floor Plate (just enough to clear). 3.) Jiggle Spring and Follower to remove. Do not remove the Follower from the Spring. TO CLEAN and LUBRICATE, Wipe dirt from Magazine Body, Spring, and Follower. Then lightly lubricate the Spring.REASSEMBLY is reverse of steps above. Make sure to slide the base under all four tabs until it snaps back under the catch. 2.) Remove Magazine Floor Plate by sliding it out of the Magazine Body. 27 REASSEMBLY (continued) … 14.) Close the Upper and Lower Receiver groups and push in the Takedown Pin. 17.) Re-attach the Sling. When re-attaching the Handguards, use The “Buddy System ”: 15.) Place the Rifle on the Buttstock and press down on the Slip Ring with both hands. Note: The “Half-Round ” Handguards are identical and can be used on top or bottom. 16.) Have your buddy install one handguard on top and the other on the bottom.
29 30 PREVENTATIVE MAINTENANCE CHECKS & SERVICES… CHECK BEFORE YOU FIRE! … 1.) Check to see that there is no excessive oil in the Bore. If there i\ s, swab it out with a patch and the cleaning rod. 2.) Retract the Bolt to ensure free movement between Bolt Carrier and Gas Tube. 3.) Perform Safety Function Check to ensure that Safety Selector Lever works properly. 4.) Check to ensure that the Magazine is secure. SAFETY FUNCTION CHECK… UNLOAD RIFLE - REMOVE MAGAZINE - CHECK CHAMBER See Safety Check next page. Then back to Step 4. 1.) R em ove m agazin e if in sta lle d. P ull C harg in g H andle a sse m bly to r e ar. C heck th a t C ham ber is c le ar. L et B olt a nd B olt C arr ie r c lo se . D o n ot p ull T rig ger. L ea ve H am mer in c o cke d p osit io n. W ARNIN G : If R if le fa ils a ny o f th e fo llo w in g te sts , c o ntin ued u se o f th e R if le c o uld r e su lt in in ju ry to , o r d eath o f, p ers o nnel. 2 .) P la ce S ele cto r Leve r in S AFE posit io n and pull Trig ger. TH E H AM MER S H O ULD N O T F A LL. 3.) P la ce S ele cto r L eve r in F IR E p osit io n. P ull tr ig ger. T H E H A M MER S H O ULD F A LL. N O TE : F or th e p urp ose o f th e fo llo w in g c h eck, S LO W is d efin ed a s o ne f o urth to o ne h a lf th e n orm al r a te o f tr ig ge r r e le a se . 4.) H old T rig g er to th e r e ar, p ull C ha rg in g H andle to th e r e ar, a nd r e le ase p re ssu re o n th e T rig ger w it h a s lo w , s m ooth m otio n , w it h out h esit a tio ns o r s to ps, u ntil th e T rig ger is fu lly fo rw ard . A N A UDIB LE C LIC K S H O ULD B E H EA RD - T H E H AM MER S H O ULD N O T F A LL. 5.) R ep eat th e FIR E posit io n te st fiv e tim es. The R if le m ust no t m alf u nctio n d urin g a ny o f th ese fiv e te sts . If th e R if le m alf u nctio ns d urin g a ny o f th ese f iv e te sts , h ave t h e R if le c h ecke d b y a q ualif ie d g un sm it h .
31 32 ADJUSTABLE FRONT SIGHT POST… A2 DUAL APERTURE REAR SIGHT… (See Page 36 for A1 Sight information) The Front Sight Post is moved up and down when “Zeroing ” the Rear Sight. Once the Rear Sight is zeroed, the Front Sight Post should not be moved.\ LOADING A MAGAZINE … SH O RT R ANG E - T his “la rg er” a pertu re is u se d fo r 0 - 2 00 m ete rs ra nge. A s sh ow n a bove , th e s ig ht is s e t to r 0 - 2 00 m ete rs . T his l a rg er a pertu re is o nly u se d w hen th e 8 /3 m ark in g is a lig ned w it h th e v e rtic a l m ark o n t h e le ft s id e o f th e u pper r e ce iv e r. N O RM AL R AN G E - T he s m alle r a pertu re is u nm ark e d and is use d fo r most fir in g s it u atio ns. It is u se d in co n ju nctio n w it h th e e le va tio n k n ob fo r 3 00, 4 00, 5 00, 6 00, 7 00, a nd 8 00 m ete r t a rg ets . 1 .) U se o nly q ualit y a m munit io n s u it a ble fo r y o u r fir e arm . E xa m in e e ach ca rtr id ge - p artic u la rly a ro und th e p rim er. L ook fo r d ents , s cra tc h es, a nd o th er s ig ns o f d a m age. D o n ot lo ad d am ag ed a m munit io n. 2.) W it h th e m agazin e fa cin g fo rw ard a s sh ow n in th e i llu str a tio n , p la ce a r o und b etw een th e lip s o f th e m agazin e w it h th e b ulle t tip fo rw ard . P ush th e ro und d ow n u ntil it is h eld b y th e m aga zin e lip s. 3 .) If n ece ssa ry , g iv e th e ro und a s lig ht p ush b ackw ard to s e at it a gain st th e b ack e dge o f th e m agazin e lip s. P la ce n ext r o und o n to p o f p re vio us r o un d a nd r e pe at s te ps u ntil d esir e d n u m ber o f r o unds is lo aded. C AUTIO N: S afe f ir e arm s h an dlin g d ic ta te s t h at y o u O NLY L O AD L IV E A M MUNIT IO N IN TO Y O UR R IF LE W HEN Y O U A RE A BO UT T O S H O OT. TH E F O RW ARD A SSIS T… The fo rw ard a ssis t h elp s lo ck th e b olt in to th e b a rre l, b ut it w il l o nly b e u se fu l o n ra re o cca sio ns w hen th e b olt fa ils to lo ck a uto m atic a lly . If y o u fin d th at y o u n eed to u se th e fo rw ard a ssis t, it is p ro bably tim e y o u c le aned y o ur rif le - p ay p artic u la r a tt e ntio n to th e lo ckin g lu g a re as in th e c h am ber a nd o n th e b olt . C AUTIO N: A LW AYS C HEC K T H AT A M MUNIT IO N IS C LE A N A N D U NDA M AG ED B EFO RE U SIN G T H E F O RW ARD A SSIS T. F orc in g d ir ty o r d am aged a m m unit io n in to th e c h am ber c o uld d am age y o ur r if le a n d c o u ld r e su lt in in ju ry , d eath o r p ro perty d am age.
34 ZEROING ADJUSTMENTS (continued)… *A II th e a bove v a lu es h ave b een r o un ded o ff . T o re m em ber y o ur c o rre ct z e ro w in dage , n ote lo ca tio n o f W in dage S ca le a nd W in dage K nob WINDAGE KNOB POINTERIMPACT0.3 cm (1/8 in.)1.25 cm (1/2 in.)2.50 cm (1 in.) 3.8 cm (1 1/2 in.)5.0 cm (2 in.)6.3 cm (21/2 in.)7.6 cm (3 in.)8.8 cm (3 1/2 in.)10.0 cm (4 in.) FOR WINDAGE KNOB (per click)*… DISTANCE25 meters100 meters200 meters300 meters400 meters500 meters600 meters700 meters800 meters WINDAGE SCALE 25 METER ZEROING PROCEDURES … Pla ce a n a p pro pria te 2 5 M ete r P ap er S ig htin g T arg et 2 5 m ete rs d ow nra n ge a n d f o llo w t h e s te p s b elo w t o e sta b li s h a “ b attle sig ht” z e ro . 1 .) D o n ot m ove th e fr o nt s ig ht p ost o n y o ur B ush m aste r X M 15 E 2S r if le a t th is tim e. It w as s e t a t t h e f a cto ry a nd s h ould b e v e ry c lo se to y o ur z e ro . 2.) C ente r th e re ar sig h t a pertu re b y tu rn in g th e w in dage kn ob le ft o r rig ht. T his is ca lle d M ech an ic al Z ero W in dag e. 3 .) T he U nm ark e d ( s m alle r) A pertu re s h o uld b e u p. 33 ZEROING YOUR SIGHTS … This is th e p ro ce dure to fo llo w in o rd e r to “ Z ero ” y o ur m ech anic a l s ig hts . 1 .) In th is p ro ce dure , th e F ro n t S ig h t P ost a nd R ear S ig ht W in d age K nob a re a dju ste d s o th at y o u c a n h it y o ur p oin t o f a im a t 3 00 m ete rs : 2 .) F lip th e u nm ark e d ( s m alle r) a pertu re to th e u p p osit io n ( a s s h ow n). 3 .) .S et th e R ear S ig ht s o th at th e 3 00-m ete r m ark is a lig ned w it h th e m ark o n th e le ft s id e o f th e r e ce iv e r. ZEROING ADJUSTMENTS … 1.) D urin g z e ro in g p ro ce dure s, o nly th e fr o nt s ig ht p ost a nd w in dage k n ob a re a dju ste d to m ove th e s tr ik e o f th e b ulle t o n th e ta rg et. 2 .) If y o u a re z e ro in g o n a 2 5-m ete r r a ng e, th e r e ar s ig ht e le va tio n k n ob is a dju ste d to t h e 3 0 0-m ete r m ark p lu s o ne c lic k u p. 3.) . A ls o s e e th e d eta ile d z e ro in g p ro ce dure s o n t h e fo llo w in g p ages. F R O NT S IG HT: T o a dju st e le va tio n, d epre ss d ete n t a nd ro ta te p ost. T o ra is e s tr ik e o f b ulle t, ro ta te p ost in th e d ir e ctio n o f a rro w m ark e d U P. R eve rs e th e d ir e ctio n o f ro ta tio n to l o w er s tr ik e o f b ulle t. E ach g ra duatio n (n otc h ) m ove s th e p oin t o f im pa ct o f b ulle t a s in dic a te d. 300 METERS ON THE ELEVATION KNOB (dial rotated down) IMPACT 0.9 cm (3/8 in.) 3.5 cm (1 3/8 in.) 7.0 cm (2 3/4 in.) DISTANCE 25 meters 100 meters 200 meters
25 METER ZEROING PROCEDURES (continued)…4.) N ow r o ta te th e e le va tio n k n o b u p o ne c lic k p ast th e 3 00-m ete r m ark . F ro m th is p oin t o n, th e e le va tio n k n ob s h ould n ot b e m ove d. A ny c h an g es in e le va tio n re quir e d in th e fo ll o w in g z e ro in g s te ps a re m ad e to t h e f r o nt s ig ht p ost o nly . 5 .) C are fu lly a im a nd fir e a t th e c e nte r o f th e ta rg et b ulls -e ye . 6.) If y o ur s h ot g ro up is n ot in th e c e n te r o f th e b ulls -e ye , u se th e s q ua re s o n th e ta rg et s h ee t to c a lc u la te t h e r e quir e d c lic ks n ece ssa ry t o m ove y o ur n ext s h ot g ro up in to th e b ulls -e ye . R em em ber - a n y c h an ges in e le vatio n a re m ad e b y m ovin g f r o nt s ig ht p ost o nly ! 7.) In o rd er to r a is e y o ur n ext s h ot g ro up, ro ta te th e fr o nt s ig ht p ost c lo ckw is e . O ne c lic k o f t h e f r o nt s ig ht p ost w ill m ove t h e t h e b ulle t s tr ik e o n e v ertic al s q u are o n t h e t a rg et s h eet. In o rd er t o lo w er y o ur n ex t s h ot g ro up, r o ta te th e fr o nt s ig ht p ost c o unte r- c lo ckw is e . O ne c li c k o f th e f r o n t s ig ht p ost, a s a bove , e quals o ne s q uare . C han ges in w in dag e a re m ad e w it h t h e w in dag e k n ob . T h re e c li c ks w ill m ove t h e s tr ik e o f t h e b ulle t o ne h oriz o nta l s q uare o n t h e t a rg et s h ee t. In o rd er to m ove th e s h ot g ro up to th e le ft, t u rn t h e w in dag e k n ob c o un te rc lo ckw is e. In o rd er to m ove th e s h ot g ro up to t h e r ig ht, t u rn t h e w in dag e k n ob c lo ckw is e. 8.) C are fu lly a im a nd fir e a noth er g ro up a t th e c e nte r o f th e ta rg et b ulls -e ye . 9.) R epe at S te ps 7 th ro ugh 9 , if r e quir e d. 10.) If y o ur g ro up is o n ta rg et, y o ur s ig h t is n o w c a lib ra te d. T o p la ce y o ur a ctu a l 3 00-m ete r z e ro o n th e rif le , y o u m ust ro ta te th e e le va tio n k n ob o ne c lic k d ow n. (T he ra nge s ca le s 3 00-m ete r m ark s h ou ld n ow b e a lig ned w it h t h e m ark o n t h e r if le s r e ce iv e r.) UNMARKED APERTURE APERTURE MARKED LEARLIER A1 ROUND SIGHT POST FIVE NOTCHES 36 A 1 T yp e R if le s h ave s ig hts t h at d if fe r a b it f r o m t h e la te r A 2 S ty le . T he A 1 R EA R S IG HT H as tw o a pertu re s fo r d if fe rin g r a nges b ut d oes n ot o ffe r a ny m ech anic a l m eans o f a dju stm en t fo r e le va tio n • U se th e u nm ark e d a pertu re fo r ta rg ets fr o m 0 - 3 00 m ete rs . • U se th e a pertu re m ark e d L fo r ta rg ets fr o m 3 0 0 - 4 00+ m ete rs . T he A 1 F R O NT S IG HT - H as fiv e n otc h es o f e le va tio n p er re vo lu tio n (in ste ad o f th e fo ur n otc h es fo und o n A 2 s q uare p ost ty p e fr o n t s ig ht - B ush m aste r o nly u se s th e A 2 ty p e F ro nt S ig ht P ost in it s c u rre nt p ro ductio n m odels ). 1 .) B att le sig ht z e ro is th at s e ttin g o n th e R if le s s ig h ts w hic h w ill c a use th e p oin t o f a im a nd s tr ik e o f th e b ulle t to b e th e s a m e a t 2 50 m ete rs . 2 .) W hen u sin g th e L -m ark e d a pertu re , th e p ath o f th e b ulle t w il l c ro ss th e lin e o f s ig ht a t 2 5 m ete rs . H ence , z e ro in g is n ow c o nducte d w it h p oin t o f a im a nd p oin t o f im pact b ein g th e s a m e ( s e e c h art o n n ext p age). 35 A1 TYPE RIFLE SIGHTS - DIFFERENCES & ADJUSTMENTS …
A1 SIGHTS - DIFFERENCES & ADJUSTMENTS (continued)… NO TE : T o z e ro th e r if le , a dju st th e fr o nt s ig ht ( e le va tio n) a nd th e r e a r s ig ht ( w in dage ) s o th at y o u c a n h it th e a im in g p o in t a t a g iv e n r a nge. F R O NT S IG HT - T o adju st ele va tio n, depre ss de te nt and ro ta te post as d escrib ed p re vio usly fo r A 2 F ro nt S ig h t P ost. T he 5 n otc h es o f th e A 1 p ost a llo w fo r a fin er a dju stm en t th an d oes th e s q uare A 2 P ost w it h 4 n otc h e s. N O TE : B ush m aste r u se s o nly th e n ew er A 2 s q uare fr o n t s ig ht p ost. R EA R S IG HT - T o a dju st w in dag e, d ep re ss d e te nt a nd ro ta te d ru m to d ir e ctio n y o u w ant. E ach n otc h m ove s th e p oin t o f im pact o f b ulle t a s i n dic a te d in c h art. 1 .) T o m ove p oin t o f im pact to rig ht, tu rn d ru m c lo ckw is e in d ir e ctio n o f a rro w a nd le tt e r R . 2.) T o m ove p o in t o f im pact to le ft, tu rn d ru m c o un te rc lo ck w is e . LONG RANGE APERTURE 250 M375 M 25 M 25 M L.R.S. REGULAR APERTURE DISTANCE 25 meters 100 meters 200 meters IMPACT 0.7cm (17/64 in.) 2.8cm (1-3/32 in.) 5.6cm (2-13/64 in.) 38 37 OPERATION OF YOUR RIFLE … LOADING… CAUTION: ALWAYS POINT THE MUZZLE IN A SAFE DIRECTION! 1.) With Hammer cocked, place Selector Lever on SAFE. 2.) Open Bolt and check Chamber. Make sure it is clear. WARNIN G : If a n otic eab le d if fe re n ce in s o un d o r re co il is e xp erie n ced , S TO P F IR IN G . E it h er c o ndit io n c o uld in dic ate a n in co m ple te p ow der b urn a n d/o r a b ulle t s tu ck in th e b ore (A ls o s e e P age 4 5). R etr a ct th e b olt s lo w ly a n d re m ove th e fir e d c artr id ge c ase. C le ar t h e w eap on a n d c h eck f o r u nburn ed p ow der g ra in s in t h e r e ceiv er o r b ore , a n d f o r a b ulle t s tu ck in th e b ore . C le an o ut a n y u nbu rn ed p ow der b efo re re su m in g fir in g. If a b ulle t is s tu ck in th e b ore , d o n ot a tte m pt to re m ove it . T ake th e rif le to a q ualif ie d g unsm it h .