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mrraley

Technical specs.

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BARRELS

 

·         AR-10 barrels are 4140 steel, chrome lined, button cut, and double lapped.

·         Eagle Arms standard barrels are chrome-moly, button cut, and double lapped.

·         M-15 barrels are 4150 steel, CMV (Chrome Moly Vanadium) MIL-B-11595-E (military spec) chrome lined, button cut, and double lapped.

·         All Stainless Steel barrels use AISI 416R stainless steel, button cut, and triple lapped.

·         Chrome lined and chrome moly barrels .750 at the journal (under the gas block).

·         Stainless steel barrels .875 at the journal (under the gas block).

·         All AR-10 barrels are NATO chambered and will accept 7.62 X 51 and .308 Winchester ammo.

·         M-15 stainless steel barrels (Wylde chamber) and chrome lined barrels (NATO chamber) will accept 5.56 X 45 and .223 Remington ammo.

·          All chrome-lined barrels are made from SAE 4140 or SAE 4150 steel and receive manganese phosphate per 5.3.1.2 of MIL-STD-171.

 

 

BARREL EXTENSIONS

 

·         Threads on barrel extensions - (.223) 1-3/16 X 16 - (.308) 1 X 16.

·         Distance between barrel extensions and locking lugs - (.223) .497   +/- .005 - (.308) .610   +/- .005

 

 

UPPER and LOWER RECEIVERS

 

·         AR-10 uppers use 7175-T74 aluminum (forged) and lowers use 7175-T73 aluminum (forged).

·         M-15 uppers use 7075-T6 aluminum (forged) and lowers use 7075-T6 aluminum (forged).

·         All AR-10 and M-15 upper and lower receivers’ exterior: Hard coat anodized per MIL-A-8625, type 3, class 2, film thickness .0010+/- .0002, finish shall be lusterless (flat) color black # 37038 of Fed-Std-595, seal, grit blast prior to applying finish.

 

 

ASSORTED PINS

 

·         AR-10 and M-15 hammer and trigger pins have an OD of .154.

·         M-15 pivot (.9” long) and takedown (1.14”) pins have an OD of .248 -.250.

·         AR-10 pivot (1.18”) and takedown pins (1.36”) have an OD of .2745 - .2755.

·         NM oversized pivot and takedown pins for M-15’s have an OD of .250 - .251.

·         NM oversized pivot and takedown pins for AR-10’s have an OD of .277 - .291.

·         AR-10 cam pin - .375 OD pin, .400 X .500 head.  Doesn’t rotate within bolt carrier.

·         M-15 cam pin - .310 OD pin, .317 X .400 head.  Rotates within bolt carrier.

 

BOLT CARRIERS

 

·         AR-10 and M-15 bolt carriers are chrome lined on the inside (not the outside).

·         AR-10 and M-15 gas keys are chrome lined.

·         AR-10 bolts and carriers use 8620 steel.

·         M-15 bolts use 158 Carpenter steel and carriers use 8620 steel.

·         AR-10 and M-15 bolts and carriers are shot peened and grip blast finished.

 

 

SIGHTS

 

·         EX3406 MWI Universal Flip Up Rear Sight – dual aperture dimensions .200 / .070.

·         NM M-15 rear sight – 1/4 MOA windage and 1/2 MOA elevation (integrated carry handle).

·         NM M-15 rear sight – 1/4 MOA windage and 1/2 MOA elevation (detachable carry handle).

·         NM AR-10 rear sight – 1/4 MOA windage and 1/4 MOA elevation (detachable carry handle).

·         All standard AR-10 and M-15 rear sights – 1/2 MOA windage and 1 MOA elevation.

·         All AR-10 and M-15 front sight posts have 4 detents per revolution. 1/4 turn up or down = 1 MOA

·         Jones sight kit (15806200) NM hooded sight parts kit apertures (# 2) .042, (# 3) .046, (# 4) .051, and (# 5) .055.

·         AR-10/M-15 front sight post height (base to tip) - .280

·         AR-10/M-15 standard rear battle sight dual apertures .70 / .195

·         AR-10/M-15 NM ramped front sight posts of .05, .06, and .07 (AR-10 receives 2 sets of these).

 

 

 

GAS BLOCKS

 

·         M-15 top of gas block and upper receiver rail – top of gas block is .293 (+/- .010) lower than top of upper receiver.

·         AR-10 top of gas block and upper receiver rail – top of gas block is .398 (+/- .010) lower than top of upper receiver.

·         M-15 CMV chrome lined and NM SST barrel journal .750, 15T SST barrel journal .875

·         AR-10 chrome lined and SST 10T carbine barrel journal .750, all other SST barrel journals are .875

·         AR-10 Super SASS adjustable gas block length - .900.  Journal is .875.

·         AR-10 / M-15 Gas Block Shim Spacer - .750 ID, .850 OD, .030 thick.

 

 

 

MAG SPRINGS

 

·         Magazine springs for the AR-10, M-15, and AR-30 – stainless steel, type 17-7 pre-hardened ASTM A313.

 

 

 

SCOPE MOUNTS

 

·         1” = 25.4MM

·         30MM = 1.18”

 

Medium height - 1” and 30MM = 1.250” from top of upper receiver to center of scope rings (up to 50MM objective).

 

      High height - 1” and 30MM = 1.450” from top of upper receiver to center of scope rings (up to 60MM objective).

 

       7/64” Allen wrench for scope ring screws.

 

 

 

RECEIVER EXTENSION TUBES

 

      Receiver extension tubes use 6061-T6 extruded aluminum.

 

·         .223 / .308 rifle length 9-11/16” (inside depth)

·         .223 carbine length 6-15/16” (inside depth)

·         .308 carbine length 7-5/8” (inside depth)

 

      Commercial size tube O.D. - 1.165” – 1.167” (we don’t use this anymore)

 

      Military (G.I.) size tube O.D. – 1.145” – 1.147” (carbine and rifle)

 

      Thread size 1-3/16 X 16

 

 

 

BUFFER SPRINGS

 

·         .308 buffer spring rifle and carbine length 14-1/8”

·         .223 buffer spring rifle length 13-1/2” max – 11-3/4” min

·         .223 buffer spring carbine length 11-1/4” max – 10-1/16” min

 

 

 

BUFFERS

 

·         .223 rifle length 5-7/8” – weight 5.2 oz

·         .308 rifle length 5-3/16” – weight 5.4 oz

·         .223 carbine length 3-1/4” – weight 3.0 oz

·         .308 carbine length 3-1/4” – weight 5.4 oz

 

 

 

TORQUE SPECS

 

·         Bolt carrier gas key screws – 55 inch lbs

·         Barrel nut .223 – 35-65 ft lbs

·         Barrel nut .308 – 45-85 ft lbs

·         Barrel extensions .223 / .308 – 150 ft lbs

·         Receiver extension tube rifle – 35-39 inch lbs

·         Receiver extension tube carbine – 40 (+/- 2”) inch lbs and stake

·         Flash suppressor – 15-20 ft lbs

·         Gas blocks and A2 front sight bases – 65 inch lbs

·         SPR Mod 1 Barrel nut – 50-60 ft lbs

 

 

 

BARREL THREAD SIZE (FLASH SUPPRESSORS AND MUZZLE BRAKES)

 

·         .223 / M-15 and 180B– 1/2”-28

·         M-15 – 7.62 X 39 and 6.8 – 5/8”-24

·         .308 / AR-10 – 5/8”-24

·         .308, .300, and .338 / AR-30 – 5/8”-18 UNF-3A

·         .300 AR-30A1 – 5/8”-24 / .338 AR-30A1 – 3/4”-24

·         .308 AR-31 – 5/8”-24

·         50BMG & .416 Barrett / 50A1 – 1”-14 UNS-3B

 

 

 

AR-10 CRUSH WASHER – M-15 PEEL WASHER

 

·         AR-10 crush washer – 1/8” thick – 5/8” ID – 7/8” OD

·         M-15 peel washer – 1/16” thick – 1/2" ID – 5/8” OD

 

 

 

TRIGGER WEIGHTS FROM FACTORY

 

·         Tactical two stage – 1st stage 3.5 lbs – 2nd stage 5-6 lbs (MIM – Metal Injected Molded)

·         NM two stage – 1st stage 2.5 lbs – 2nd stage 4.5-5 lbs (MIM – Metal Injected Molded)

·         Standard military trigger – 5.5-9.5 lbs (Cast)

·         Schilen single stage trigger (AR-50/AR-50A1 – AR-30/AR-30A1/AR-31) 4.5 lbs approximate

 

 

      Note:  All triggers were cast until March of 2009.  Only the single stage trigger is cast now.

 

 

 

LENGTH OF PULL

 

·         AR-10 carbine (collapsed) – 11-1/8” - (extended) – 14-1/2”

·         M-15 carbine (collapsed) – 10-3/8” - (extended) – 14-1/2”

·         AR-10 rifle – 14-1/2”

·         M-15 rifle – 14-1/2”

·         AR-30 – (all) 13-1/2”

·         AR-30A1 – (standard) 13.5” (target) – 13.6 - 15.6

·         AR-31 – (target) 13.6 – 15.6

·         AR-50 - (all) 14.9”

 

 

 

DETACHABLE FRONT SIGHT HEIGHT

 

·         E20151 M-15 detachable front sight – 1.395” height

·         EA5045 AR-10 detachable front sight – 1.531” height

 

 

 

GAS TUBE LENGTH

 

·         M-15 rifle – 15-3/16”

·         M-15 mid length carbine – 11-3/4”

·         M-15 shorty carbine – 9-3/4”

·         AR-10 rifle – 15-1/2”

·         AR-10 mid length carbine – 12-1/16”

·         All gas tubes: .180 OD and .117 ID

 

 

 

THREAD SIZE FOR UPPER RECEIVERS FOR BARREL NUTS

 

·         M-15 – 1-1/4” X 18 UNF-3A

·         AR-10 – 1-7/16” X 18 UNEF-3A

 

       * UNF = Unified Fine thread.  UNEF = Unified Extra Fine thread.

 

 

 

DISTANCE FROM BORE CENTERLINE TO TOP OF PICATINNY RAIL OF UPPER RECEIVER

 

·         M-15 – 1.213”

·         AR-10 – 1.318”

 

 

 

GO GAGE CHAMBER SPEC INFORMATION (TOLERANCES FOR GOOD-TO-GO CHAMBERS)

 

·         AR-10 NATO – 1.633-1.638 (stainless steel, chrome moly, and chrome lined barrels)

·         M-15 NATO – 1.465-1.468 (chrome moly and chrome moly vanadium/chrome lined barrels)

·         M-15 WYLDE – 1.464-1.467 (stainless steel barrels)

 

 

 

MCFARLAND GAS RING ACCEPTABLE OD DIMENSIONS

 

·         M-15 = .499 - .501

·         AR-10 = .656 - .659

 

      Note: There is no acceptable or unacceptable M-15 single gas ring OD dimensions as they flex within the bolt.

 

 

 

M-15 AND AR-10 PORT DOOR ROD LENGTHS

 

·         M-15 (All) 3-7/8” long

·         AR-10 (Standard) 4-1/16” long

·         AR-10 (“T”) – 4-3/16” long – used also on any AR-10 that uses a free floated handguard

 

 

 

FIREARM WEIGHTS (IN LBS)

 

·         10A2F & 10A2BF = 9.2

·         10A4F & 10A4BF = 8.91

·         LE10A4CBA2F = 9.0

·         10A4243BF = 8.95

·         10TNF & 10TBNF = 10.29

·         10TNF260 & 10TBNF260 = 10.51

·         10TBNF338 = 9.65

·         10SBF = 11.84

·         A10SBF = 12.0

·         10A4BNMF = 11.49

·         10A2CF & 10A2CBF = 7.98

·         10A4CF & 10A4CBF = 7.75

·         A10A4CBF = 7.94

·         10TCBNF = 8.61

 

·         15A2 & 15A2B = 7.93

·         15A2NM & 15A2BNM = 9.14

·         15A2C & 15A2CB = 7.01

·         15A4 & 15A4B = 7.68

·         15A4C & 15A4CB = 6.45

·         15A4C-6.8 & 15A4CB-6.8 = 6.43

·         15A4C-7.62X39 & 15A4CB-7.62X39 = 6.41

·         15A4CBA2K = 6.53

·         15A4NM & 15A4BNM = 9.8

·         15A4TN & 15A4TBN = 8.78

·         LEC15A4CBK & LEC15A4CBK-1:7 = 6.35

·         15SPR1LB = 6.79

·         15SPR1CB = 7.43

·         15SPR1CB-6.8 = 7.41

·         15SPR1CB-7.62X39 = 7.39

 

 

 

 

SUGGESTED (GRAIN) AMMO FOR ALL FIREARMS, BARREL TWIST & GROOVE

 

·         M-15 (16” and 20”) CMV chrome lined barrels – 52-69 grain – 1:9 RH - 6 groove

·         M-15 (20”) SST barrels – 69-80 grain – 1:8 RH - 6 groove

·         M-15 (16”) 6.8 SPC II CMV chrome lined barrels – 110-115 grain – 1:11 RH - 4 groove

·         M-15 (16”) 7.62X39 CMV chrome lined barrels (bore .311) – 123 grain – 1:10 RH - 4 groove

·         M-15 SPR Mod 1 (16”) (shorty 6” gas system) CMV chromed lined barrels – 69-80 grain – 1:7 RH - 6 groove

·         M-15 SPR Mod 1 (16”) (mid-length 8” gas system) CMV chrome lined barrels – 52-69 grain – 1:9 RH - 6 groove

·         M-15 (16”) .22LR – CMV chrome lined barrels – 1:16 – 5 groove

 

·         AR-10 (16” and 20”) chrome lined barrels – 150-175 grain – 1:11.25 RH - 6 groove

·         AR-10 (20”) .243 chrome moly barrels – 90-100 grain – 1: 10 RH - 6 groove

·         AR-10 (22”) .260 SST barrels – 120-140 grain (139 and 140 grain functioned best) – 1:8 RH - 6 groove

·         AR-10T (16” & 20”) SST barrels – 150-185 grain – 1:10 RH - 6 groove

·         AR-10 (20”) SuperSASS SST barrels – 150-185 grain – 1:10 RH - 6 groove

·         AR-10 (20”) NM SST barrels – 168-185 grain - (Will stabilize 200 grain ammo) – 1:10 RH - 4 groove

·         AR-10 (22”) .338 Federal SST barrels – 185-200 grain (Max 225 grain ammo) – 1:10 RH - 6 groove

 

 

 

 

TECHNICAL SPEC INFORMATION 2.pdf

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