Colt Ar Serial Number Lookup

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The year/serial numbers under Colt SP series was forwarded to me by an individual whose return address I no longer have. Double asterisk (.) under Bushmaster, a person on the internet e-mailed me that he had a lower that was shipped stripped (thus not a complete rifle) in 1991 from Bushmaster with serial #0327XX – ALWAYS CALL TO VERIFY.

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This article is about AR-15 variants made by Colt's Manufacturing Company. For generic variants, see AR-15 style rifle.
ArmaLite AR-15 with the charging handle located on top of the upper receiver, protected within the carrying handle and a 25-round magazine
1973 Colt AR-15 SP1 rifle with 'slab side' lower receiver (lacking raised boss around magazine release button) and original Colt 20-round magazine.
M16A1 rifle with forward assist, raised boss around magazine release button and a 30-round magazine.

This article describes the many variations of the Colt AR-15 and M16 rifle family of weapons produced by Colt's Manufacturing Company. Weapons patterned on the original ArmaLite AR-15 design have been produced by numerous manufacturers and have been used by nations around the world, some of which created their own variations. The tables here are split in a variety of categories, and provide an overview of different subtypes. For purposes of these tables, bold model numbers are weapons used (or previously used) by the U.S. Military while italic model numbers are weapons for commercial or export sale. See Glossary of terms for an explanation of each column.

  • 1Colt military models
  • 2Colt civilian models
  • 3Glossary of terms

Colt military models[edit]

Colt has been the most visible producer of ArmaLite AR-15 pattern weapons, and the military designations M16 & M4 are heavily associated with the company. Colt has an intricate internal nomenclature system for its models, with a variety of suffixes and prefixes. Colt’s systems have generally followed the times and though its model numbers originally came without prefixes, with the need to separate weapons made for civilian consumption from those made for military and law enforcement use, military models became prefixed with the code 'RO'. For the purposes of this table, the RO nomenclature is obviated as this terminology did not exist in all cases, but it can be understood to be present. Military/LE models are also easily identified by their three digit code in contrast to the four digit codes for civilian weapons.

Colt Armalite AR-15[edit]

The original Armalite AR-15 have the charging handle located on top of the upper receiver, protected within the carrying handle.

COLT 6520 SERIAL NUMBER QUERY - AR15.COM

Colt model no.NameStockHand guardsFire controlRear sightForward assistCase deflectorCaliberBarrel lengthBarrel profileBarrel twistBayonet LugMuzzle device
601ArmaLite AR-15
(AKA: XM16)
A1TriangularS-1-FA1NoNo.222 REM20 in.A11:14 (early)
1:12 (late)
YesType 1 Duckbill
Type 2 Duckbill
602ArmaLite AR-15
(AKA: XM16)
A1TriangularS-1-FA1NoNo.223 REM20 in.A11:12YesType 2 Duckbill

Colt M16 rifle based weapons[edit]

Colt model no.NameStockHand guardsFire controlRear sightForward assistCase deflectorCaliberBarrel lengthBarrel profileBarrel twistBayonet LugMuzzle device
603M16A1 (AKA:XM16E1)A1TriangularS-1-FA1YesNo.223 REM20 in.A11:12YesType 2 Duckbill or A1 Birdcage
604M16 rifleA1TriangularS-1-FA1NoNo.223 REM20 in.A11:12YesA1 Birdcage
605CAR-15 CarbineA1TriangularS-1-FA1NoNo.223 REM15 in.A11:12NoType 2 Duckbill
605ACAR-15 CarbineA1TriangularS-1-FA1YesNo.223 REM15 in.A11:12NoType 2 Duckbill
605BCAR-15 CarbineA1TriangularS-F-1-3A1NoNo.223 REM15 in.A11:12NoType 2 Duckbill
606CAR-15 Heavy Assault Rifle M1 (AKA:Colt Automatic Rifle or Colt Light Machine Gun)A1TriangularS-1-FA1NoNo.223 REM20 in.HBAR1:12YesType 2 Duckbill
606ACAR-15 Heavy Assault Rifle M1 (AKA:Colt Automatic Rifle or Colt Light Machine Gun)A1TriangularS-1-FA1YesNo.223 REM20 in.HBAR1:12YesType 2 Duckbill
606BCAR-15 Heavy Assault Rifle M1 (AKA:Colt Automatic Rifle or Colt Light Machine Gun)A1TriangularS-F-1-3A1YesNo.223 REM20 in.HBAR1:12YesType 2 Duckbill
607CAR-15 SMG1st GenerationShort TriangularS-1-FA1NoNo.223 REM10 in.A11:12NoType 1 and 2 Duckbill and 3.5' Moderator
607ACAR-15 SMG1st GenerationShort TriangularS-1-FA1YesNo.223 REM10 in.A11:12NoType 1 and 2 Duckbill and 3.5' Moderator
607BCAR-15 SMG1st GenerationShort TriangularS-F-1-3A1NoNo.223 REM10 in.A11:12NoType 1 and 2 Duckbill and 3.5' Moderator
608CAR-15 Survival RifleTubularShort RoundS-1-FA1NoNo.223 REM10 in.A11:12NoConical or 3.5' Moderator
609Commando (AKA: XM177E1 or CAR-15)2nd GenerationShort RibbedS-1-FA1YesNo.223 REM10 in.A11:12No3.5' or 4.5' Moderator
610Commando (AKA: XM177, GAU-5/A or CAR-15)2nd GenerationShort RibbedS-1-FA1NoNo.223 REM10 in.A11:12No3.5' or 4.5' Moderator
610BCAR-15 SMG2nd GenerationShort RibbedS-F-1-3A1NoNo.223 REM10 in.A11:12No3.5' or 4.5' Moderator
611M16 HBARA1TriangularS-1-FA1YesNo.223 REM20 in.HBAR1:12YesA1 Birdcage
611PM16 HBAR (License produced by Elisco Tools)A1TriangularS-1-FA1YesNo.223 REM20 in.HBAR1:12YesA1 Birdcage
613KM16 (Licensed produced by Daewoo Precision Industries)A1TriangularS-1-FA1YesNo.223 REM20 in.A11:12YesA1 Birdcage
613PM16 (License produced by Elisco Tools)A1TriangularS-1-FA1YesNo.223 REM20 in.A11:12YesA1 Birdcage
614M16A1TriangularS-1-FA1NoNo.223 REM20 in.A11:12YesA1 Birdcage
614SM16S1 (License produced by Chartered Arms Singapore)A1TriangularS-1-FA1NoNo.223 REM20 in.A11:12YesA1 Birdcage
615M16 HBARA1TriangularS-1-FA1NoNo.223 REM20 in.HBAR1:12YesA1 Birdcage
616M16 HBARA1RoundS-1-FA1NoNo.223 REM20 in.HBAR1:12YesA1 Birdcage
619Commando (AKA:XM177E1 or CAR-15)2nd GenerationShort RibbedS-1-FA1YesNo.223 REM10 in.A11:12No3.5' or 4.5' Moderator
620Commando (AKA: CAR-15)2nd GenerationShort RibbedS-1-FA1NoNo.223 REM10 in.A11:12No3.5' or 4.5' Moderator
621M16A1 HBARA1TriangularS-1-FA1YesNo.223 REM20 in.HBAR1:12YesA1 Birdcage
629Commando (AKA: XM177E2 or CAR-15)2nd GenerationShort RibbedS-1-FA1YesNo.223 REM11.5 in.A11:12No4.5' Moderator
630Commando (AKA: GAU-5A/A or CAR-15)2nd GenerationShort RibbedS-1-FA1NoNo.223 REM11.5 in.A11:12No4.5' Moderator
633Colt SMG2nd GenerationShort RoundS-1-FA1NoYes9mm NATO7 in.A11:10NoNone
634Colt SMG2nd GenerationShort RibbedConflict between S-1 and S-1-FA1NoYes9mm NATO10 in.A11:10NoA1 Birdcage
635Colt SMG2nd, 3rd, or 4th GenerationShort RibbedS-1-FA1NoYes9mm NATO10 in.A11:10NoA1 Birdcage
635SColt SMG2nd GenerationShort RibbedS-1-FA1NoYes9mm NATO10 in.A1 w/ integral silencer1:10NoNone
639Commando (AKA: XM177E2 or CAR-15)2nd GenerationShort RibbedS-1-FA1YesNo.223 REM11.5 in.A11:12No4.5' Moderator or A1
639Colt SMG2ndShort RibbedS-1-3A1NoYes9mm NATO10 in.A1 w/ integral silencer1:10NoA2 Compensator
640Commando (AKA: XM177E2 or CAR-15)2nd GenerationShort RibbedS-1-FA1NoNo.223 REM11.5 in.A11:12No4.5' Moderator or A1
645M16A1E1/M16A2A2RibbedS-1-3A2YesYes5.56 NATO20 in.A21:7YesA2 Compensator
645EM16A2E1A2RibbedS-1-3Flattop (w/ flip down front sight)YesYes5.56 NATO20 in.A21:7YesA2 Compensator
646M16A2E3/M16A3A2RibbedS-1-FA2YesYes5.56 NATO20 in.A21:7YesA2 Compensator
649Commando (AKA: GAU-5A/A or CAR-15)2nd GenerationShort RibbedS-1-FA1NoNo.223 REM11.5 in.A11:12No4.5' Moderator
650M16A1 carbine (AKA: CAR-15)A1Short RibbedS-1-FA1YesNo.223 REM14.5 in.A11:12YesA1 Birdcage
651M16A1 carbine (AKA: CAR-15)A1Short RibbedS-1-FA1YesNo.223 REM14.5 in.A11:12YesA1 Birdcage
652M16A1 carbine (AKA: CAR-15)A1Short RibbedS-1-FA1NoNo.223 REM14.5 in.A11:12YesA1 Birdcage
653M16A1 carbine (AKA: CAR-15)2nd GenerationShort RibbedS-1-FA1YesNo.223 REM14.5 in.A11:12YesA1 Birdcage
653PM16A1 carbine (AKA: CAR-15) (License produced by Elisco Tools)2nd GenerationShort RibbedS-1-FA1YesNo.223 REM14.5 in.A11:12YesA1 Birdcage
654M16A1 carbine (AKA: CAR-15)2nd GenerationShort RibbedS-1-FA1NoNo.223 REM14.5 in.A11:12YesA1 Birdcage
655M16A1 Special High ProfileA1TriangularS-1-FA1 (used with special raised carry handle scope mount)YesNo.223 REM20 in.HBAR1:12YesA1
656M16A1 Special Low ProfileA1TriangularS-1-FFlattopYesNo.223 REM20 in.HBAR1:12YesA1 Birdcage
701M16A2A2RibbedS-1-FA2YesYes5.56 NATO20 in.A21:7YesA2 Compensator
702M16A2A2RibbedS-1-3A2YesYes5.56 NATO20 in.A21:7YesA2 Compensator
703M16A2A2RibbedS-1-FA2YesYes5.56 NATO20 in.A11:7YesA2 Compensator
705M16A2A2RibbedS-1-3A2YesYes5.56 NATO20 in.A21:7YesA2 Compensator
707M16A2A2RibbedS-1-3A2YesYes5.56 NATO20 in.A11:7YesA2 Compensator
711M16A2A2RibbedS-1-FA1YesNo and Yes5.56 NATO20 in.A11:7YesA2 Compensator
713M16A2A2RibbedS-1-3A2YesYes5.56 NATO20 in.A21:7YesA2 Compensator
715M16A2 (License produced by Diemaco/Colt Canada as the C7)A2RibbedS-1-FA1YesYes5.56 NATO20 in.A21:7YesA2 Compensator
719M16A2A2RibbedS-1-3A2YesYes5.56 NATO20 in.A11:7YesA2 Compensator
720XM4 Carbine3rd GenerationShort RibbedS-1-3A2YesYes5.56 NATO14.5 in.M41:7YesA2 Compensator
723M16A2 carbine (AKA: M4 Carbine)3rd GenerationShort RibbedS-1-FA1YesYes5.56 NATO14.5 in.A11:7YesA1 Birdcage
725M16A2 carbine (AKA: M4 Carbine) (License produced by Diemaco/Colt Canada as the C8)3rd GenerationShort RibbedS-1-FA1YesYes5.56 NATO14.5 in.A11:7YesA2 Compensator
725AM16A2 carbine (AKA: M4 Carbine)3rd GenerationShort RibbedS-1-FA1YesYes5.56 NATO14.5 in.A11:7YesA2 Compensator
725BM16A2 carbine (AKA: M4 Carbine)3rd GenerationShort RibbedS-1-FA1YesYes5.56 NATO14.5 in.A21:7YesA2 Compensator
726M16A2 carbine (AKA: M4 Carbine)3rd GenerationShort RibbedS-1-FA1YesYes5.56 NATO14.5 in.A11:7YesA1 Birdcage
727M16A2 carbine (AKA: M4 Carbine)3rd GenerationShort RibbedS-1-FA2YesYes5.56 NATO14.5 in.M41:7YesA2 Compensator
728M16A2 carbine (AKA: M4 Carbine)3rd GenerationShort RibbedS-1-FA2YesYes5.56 NATO14.5 in.M41:7YesA2 Compensator
733M16A2 Commando (AKA: M4 Commando)3rd or 4th GenerationShort RibbedS-1-FA1 or A2YesYes or No5.56 NATO11.5 in.A1 or A21:7NoA1 or A2
733AM16A2 Commando (AKA: M4 Commando)3rd or 4th GenerationShort RibbedS-1-3A1 or A2YesYes or No5.56 NATO11.5 in.A1 or A21:7NoA1 or A2
734M16A2 Commando (AKA: M4 Commando)3rd GenerationShort RibbedS-1-FA1 or A2YesYes or No5.56 NATO11.5 in.A1 or A21:7NoA1 or A2
734AM16A2 Commando (AKA: M4 Commando)3rd GenerationShort RibbedS-1-3A1 or A2YesYes or No5.56 NATO11.5 in.A1 or A21:7NoA1 or A2
735M16A2 Commando (AKA: M4 Commando)3rd or 4th GenerationShort RibbedS-1-3A1 or A2YesYes or No5.56 NATO11.5 in.A1 or A21:7NoA1 or A2
737M16A2A2RibbedS-1-3A2YesYes5.56 NATO20 in.HBAR1:7YesA2
738M4 Commando Enhanced4th GenerationShort RibbedS-1-3-FA2YesYes5.56 NATO11.5 in.A21:7NoA1 or A2
741M16A2A2RibbedS-1-FA2YesYes5.56 NATO20 in.HBAR1:7YesA2
742M16A2 (Standard w/ bipod)A2RibbedS-1-FA2YesYes5.56 NATO20 in.HBAR1:7YesA2
745M16A2 (Standard w/ bipod)A2RibbedS-1-3A2YesYes5.56 NATO20 in.HBAR1:7YesA2
746M16A2 (Standard w/ bipod)A2RibbedS-1-3A2YesYes5.56 NATO20 in.HBAR1:7YesA2
750Colt Automatic Rifle (AKA: Colt Light Machine Gun) (Colt/Diemaco project)A2Square LMGS-FA2YesYes5.56 NATO20 in.HBAR1:7YesA2
777M4 Carbine4th GenerationM4S-1-3A2YesYes5.56 NATO14.5 in.M41:7YesA2
778M4 Carbine Enhanced4th GenerationM4S-1-3-FA2YesYes5.56 NATO14.5 in.M41:7YesA2
779M4 Carbine4th GenerationM4S-1-FA2YesYes5.56 NATO14.5 in.M41:7YesA2
901M16A3A2RibbedS-1-FFlattopYesYes5.56 NATO20 in.A21:7YesA2
905M16A4A2RibbedS-1-3FlattopYesYes5.56 NATO20 in.A21:7YesA2
920M4 Carbine3rd and 4th GenerationM4S-1-3FlattopYesYes5.56 NATO14.5 in.M41:7YesA2
921M4E1/A1 Carbine4th GenerationM4S-1-FFlattopYesYes5.56 NATO14.5 in.M41:7YesA2
921HBM4A1 Carbine4th GenerationM4S-1-FFlattopYesYes5.56 NATO14.5 in.M4 HBAR1:7YesA2
925M4E2 Carbine3rd or 4th GenerationM4S-1-3FlattopYesYes5.56 NATO14.5 in.M41:7YesA2
927M4 Carbine4th GenerationM4S-1-FFlattopYesYes5.56 NATO14.5 in.M41:7YesA2
933M4 Commando4th GenerationShort RibbedS-1-FFlattopYesYes5.56 NATO11.5 in.A1 or A21:7NoA2
935M4 Commando4th GenerationShort RibbedS-1-3FlattopYesYes5.56 NATO11.5 in.A1 or A21:7NoA2
938M4 Commando Enhanced4th GenerationM4S-1-3-FFlattopYesYes5.56 NATO11.5 in.A21:7NoA2
977M4 Carbine4th GenerationM4S-1-3FlattopYesYes5.56 NATO14.5 in.M41:7YesA2
941M16A3A2RibbedS-1-FFlattopYesYes5.56 NATO20 in.HBAR1:7YesA2
942M16A3 (Standard w/ bipod)A2RibbedS-1-FFlattopYesYes5.56 NATO20 in.HBAR1:7YesA2
945M16A2E4/M16A4A2RibbedS-1-3FlattopYesYes5.56 NATO20 in.A21:7YesA2
950Colt Automatic Rifle (AKA: Colt Light Machine Gun) (Colt/Diemaco project)A2Square LMGS-FFlattopYesYes5.56 NATO20 in.HBAR1:7YesA2
'977'M4 Carbine4th GenerationM4S-1-3FlattopYesYes5.56 NATO14.5 in.M41:7YesA2
978M4 Carbine Enhanced4th GenerationM4S-1-3-FFlattopYesYes5.56 NATO14.5 in.M41:7YesA2
979M4A1 Carbine4th GenerationM4S-1-FFlattopYesYes5.56 NATO14.5 in.M41:7YesA2
991Colt SMG4th GenerationShort RibbedS-1-FFlattopNoYes9mm NATO10.5 in.A11:10NoA1 Birdcage
992Colt SMG4th GenerationShort RibbedS-1-3FlattopNoYes9mm NATO10.5 in.A11:10NoA1 Birdcage
Colt model no.NameStockHand guardsFire controlRear sightForward assistCase deflectorCaliberBarrel lengthBarrel profileBarrel twistBayonet LugMuzzle device

Colt military models without model numbers[edit]

In rare instances some Colt models have been produced without in house model numbers, or at least one which is readily apparent.

NameStockHand guardsFire controlRear sightForward assistCase deflectorCaliberBarrel lengthBarrel profileBarrel twistBayonet LugMuzzle device
M16 PIP/M16A1E1A2RibbedS-1-F or S-1-3A2YesYes5.56 NATO20 in.A21:7YesA1 or A2
M16 ACR/M16A2E2Retractable ACRACR TypeS-1-3FlattopYesYes5.56 NATO20 in.A21:7NoACR compensator
XM231 FPWFPW WireShort RoundS-FNoneNoNo.223 REM15.6 in.HBAR1:12NoA1
M231 FPWNoneShort RoundS-FNoneNoNo.233 REM15.6 in.HBAR1:12NoA1

Diemaco/Colt Canada models[edit]

The Canadian company Colt Canada (formerly Diemaco) licensed production of a rifle (Colt Model 715) and carbine (Colt Model 725), but later went on to produce an entire line of AR-15/M16 pattern weapons developed independently. In May 2005, Colt's Manufacturing Company acquired Diemaco, and the name was changed to Colt Canada.

Colt model no.Diemaco modelStockHand guardsFire controlRear sightForward assistCase deflectorCaliberBarrel lengthBarrel profileBarrel twistBayonet LugMuzzle device
715C7A2RibbedS-1-FA1YesYes5.56 NATO20 in.A21:7YesA2
N/AC7A1A2RibbedS-1-FWeaverYesYes5.56 NATO20 in.A21:7YesA2
N/AC7A2Canadian 3rd GenerationRibbedS-1-FWeaverYesYes5.56 NATO20 in.A21:7YesA2
750Colt/Diemaco LMG/LSWA2Square LMGS-FA2YesYes5.56 NATO20 in.HBAR1:7NoA2
N/ALSWA2Square LMGS-FWeaverYesYes5.56 NATO20 in.HBAR1:7NoA2
725C83rd GenerationShort RibbedS-1-FA1YesYes5.56 NATO14.5 in.A11:7YesA2
N/AC8A1Canadian 3rd GenerationShort RibbedS-1-FWeaverYesYes5.56 NATO14.5 in.A11:7YesA2
N/AC8FTHBCanadian 3rd GenerationShort RibbedS-1-FWeaverYesYes5.56 NATO14.5 in.A21:7YesA2
N/ASFWCanadian 3rd GenerationShort RibbedS-1-FWeaverYesYes5.56 NATO16 in.SFW1:7YesA2
N/AC8CQBCanadian 3rd GenerationShort RibbedS-1-FWeaverYesYes5.56 NATO10 in.A21:7YesA2
N/APDWCanadian 3rd GenerationN/AS-1-FWeaverYesYes5.56 NATO5.7' in.A21:7NoA2

Non-factory military models[edit]

NameBase weaponStockHand guardsFire controlRear sightForward assistCase deflectorCaliberBarrel lengthBarrel profileBarrel twistBayonet LugMuzzle device
GUU-5/PGAU-5/A or GAU-5A/A2nd or 3rd GenerationShort RibbedS-1-FA1YesNo5.56 NATO14.5 in.A1 or M41:7YesA1 or A2
GUU-5/PGAU-5/A or GAU-5A/A2nd or 3rd GenerationM4S-1-FA2 or FlattopYesYes5.56 NATO14.5 in.M41:7YesA2
Mekut'zarModel 6533rd Generation or IsraeliShort RibbedS-1-FA1YesNo5.56 NATO14.5 in.M41:7YesA2
Mekut'zrarModel 6532nd Generation or IsraeliShort RibbedS-1-FA1YesNo5.56 NATOVariable; 9' averageA11:12NoVarious

Colt civilian models[edit]

Colt’s civilian line of semi-automatic Colt AR-15 rifles is identified by a four digit code following a specific prefix. Initially all Colt civilian weapons were listed with an “R” prefix, with this changing to “AR” following the passage of the Federal Assault Weapons Ban in 1994. Colt also produced a line of weapons aimed at target shooters under the “MT” prefix, which stood for Match Target, as well as, the Colt Accurized Rifle, which was the only model to feature the CR prefix. Most recently with the shift in marketing policy by Colt Defense, these weapons have been given the “LE” and 'LT' prefix. The 'LT' series is modified version of the Colt 6720 featuring a lightweight 'pencil' barrel with a free floating rail system. Only 1500 of the 'LT' series were produced. Currently, Colt Defense has no line targeted specifically at the private civilian market.

R series models[edit]

Colt model no.NameStockHand guardsFire controlRear sightForward assistCase deflectorCaliberBarrel lengthBarrel profileBarrel twistBayonet LugMuzzle device
R6000AR-15 Sporter (SP1)A1TriangularS-1A1NoNo.223 REM20 in.A11:12YesType 2 Duckbill or A1
R6001AR-15 Sporter Carbine (SP1 Carbine)2nd GenerationShort RibbedS-1A1NoNo.223 REM16 in.A11:12YesA1
R6002AR-15 Sporter (SP1; Bundled with 3x scope)A1TriangularS-1A1NoNo.223 REM20 in.A11:12YesA1
R6003AR-15 Sporter Carbine (SP1 Carbine; Bundled with 3x scope)2nd GenerationShort RibbedS-1A1NoNo.223 REM16 in.A11:12YesA1
R6004AR-15 Sporter (SP1; Bundled with Colt Reflex Sighting System)A1TriangularS-1A1NoNo.223 REM20 in.A11:12YesA1
R6420AR-15A2 Sporter II Carbine3rd GenerationShort RibbedS-1A1YesNo & Yes5.56 NATO16 in.A11:7YesA2
R6430Sporter Lightweight (9 mm)A2Short RibbedS-1A1NoRemovable9mm NATO16 in.A11:10YesA1
R6450AR-15 9 mm Carbine3rd GenerationShort RibbedS-1A1NoNo & Removable9mm NATO16 in.A11:10YesA1
R6500AR-15A2 Sporter IIA2RibbedS-1A1YesNo & Yes5.56 NATO20 in.A21:7YesA2
R6510AR-15A2 Sporter II (Special export model in .222 Remington)A2RibbedS-1A2YesNo.222 REM20 in.A21:14YesA2
R6520AR-15A2 Government Carbine3rd GenerationShort RibbedS-1A2YesYes5.56 NATO16 in.A11:7YesA2
R6521Colt Carbine (AR-15A2 Government Carbine) (Special export model with receiver block and large pin upper receiver)3rd GenerationShort RibbedS-1A2YesYes5.56 NATO16 in.A11:7Yes/NoA2
R6530Sporter Lightweight .2233rd GenerationShort RibbedS-1A2YesYes5.56 NATO16 in.A11:7NoA2
R6550AR-15A2 GovernmentA2RibbedS-1A2YesYes5.56 NATO20 in.A21:7YesA2
R6550CCAR-15A2 Government (w/ factory camouflage finish)A2RibbedS-1A2YesYes5.56 NATO20 in.A21:7YesA2
R6550KAR-15A2 Government (w/ factory installed .22 Long Rifle conversion kit)A2RibbedS-1A2YesYes5.56 NATO20 in.A21:7YesA2
R6551Sporter TargetA2RibbedS-1A2YesYes5.56 NATO20 in.A21:7YesA2
R6600AR-15A2 HBARA2RibbedS-1A2YesYes5.56 NATO20 in.HBAR1:7YesA2
R6600DHAR-15A2 Delta HBAR (bundled w/ Tasco 3–9x scope and cheekpiece)A2RibbedS-1A2YesYes5.56 NATO20 in.HBAR1:7YesA2
R6600KAR-15A2 HBAR (w/ factory installed .22 Long Rifle conversion kit)A2RibbedS-1A2YesYes5.56 NATO20 in.HBAR1:7YesA2
R6601Sporter Match HBARA2RibbedS-1A2YesYes5.56 NATO20 in.HBAR1:7NoA2
R6601DHSporter Match Delta HBAR (bundled w/ Tasco 3–9x scope and cheekpiece)A2RibbedS-1A2YesYes5.56 NATO20 in.HBAR1:7NoA2
R6700Sporter Competition HBARA2RibbedS-1FlattopYesYes.223 REM
5.56 NATO
20 in.HBAR1:9NoA2
R6700CHSporter Competition HBAR (bundled w/ Tasco 3–9x scope and cheekpiece)A2RibbedS-1FlattopYesYes.223 REM
5.56 NATO
20 in.HBAR1:9NoA2
R6700SSporter Competition HBAR (bundled w/ Tasco 3–9x scope)A2RibbedS-1FlattopYesYes.223 REM
5.56 NATO
20 in.HBAR1:9NoA2
R6701Sporter Competition HBAR (Special limited edition production run)A2RibbedS-1FlattopYesYes.223 REM
5.56 NATO
20 in.HBAR1:9NoA2
R6721AR-15A3 Tactical Carbine4th GenerationShort RibbedS-1A2YesYes.223 REM
5.56 NATO
16 in.HBAR1:9YesA2
R6724Sporter Competition HBARA2RibbedS-1FlattopYesYes.223 REM
5.56 NATO
24 in.HBAR1:9NoA2
R6731AR-15A3 Competition HBARA2Short RibbedS-1A2YesYes.223 REM
5.56 NATO
16 in.HBAR1:9NoA2
R6750Sporter Competition HBAR (bundled w/ bipod)A2RibbedS-1A2YesYes5.56 NATO20 in.Super-Heavy1:7NoA2
R6821Sporter Carbine (7.62×39mm)3rd GenerationShort RibbedS-1A2YesYes7.62×39mm16 in.HBAR1:12NoA1
R6830Sporter Lightweight (7.62×39mm)A2Short RibbedS-1A2YesYes7.62×39mm16 in.HBAR1:12NoA1

AR series models[edit]

Colt ar pre ban serial number lookup
Colt model no.NameStockHand guardsFire controlRear sightForward assistCase deflectorCaliberBarrel lengthBarrel profileBarrel twistBayonet LugMuzzle device
AR6320AR-15 Lightweight4th GenerationShort RibbedS-1A1YesYes.223 REM
5.56 NATO
16 in.A11:9YesA2
AR6450AR-15 9 mm Carbine3rd GenerationShort RibbedS-1A1NoRemovable9mm NATO16 in.A11:10YesA1
AR6520AR-15A2 Government Carbine4th GenerationShort RibbedS-1A2YesYes5.56 NATO16 in.A11:7YesA2
AR6520SPAR-15A2 Government Carbine4th GenerationShort RibbedS-1A2YesYes5.56 NATO10 in.A21:7YesA2
AR6525AR-15A2 Government Carbine4th GenerationShort RibbedS-1A2YesYes.223 REM
5.56 NATO
16 in.A21:9YesA2
AR6530AR-15
Lightweight
A2Short RibbedS-1A2YesYes.223 REM
5.56 NATO
16 in.A11:7YesA2
AR6551AR-15
Target Model
A2RibbedS-1A2YesYes.223 REM
5.56 NATO
20 in.A21:7YesA2
AR6601AR-15
Match HBAR
A2RibbedS-1A2YesYes.223 REM
5.56 NATO
20 in.HBAR1:7YesA2
AR6700AR-15
Competition HBAR
A2RibbedS-1FlattopYesYes.223 REM
5.56 NATO
20 in.HBAR1:9YesA2
AR6721AR-15A3 Tactical Carbine4th GenerationShort RibbedS-1FlattopYesYes.223 REM
5.56 NATO
16 in.HBAR1:9YesA2
AR6721SPAR-15A3 Tactical Carbine4th GenerationShort RibbedS-1FlattopYesYes.223 REM
5.56 NATO
10 in.HBAR1:9YesA2
AR6951Colt 9 mm Carbine4th GenerationShort RibbedS-1FlattopNoYes9mm NATO16.1 in.A21:10YesA1 Birdcage

MT and CR series models[edit]

Colt model no.NameStockHand guardsFire controlRear sightForward assistCase deflectorCaliberBarrel lengthBarrel profileBarrel twistBayonet LugMuzzle device
CR6724Colt Accurized RifleA2FF TubeS-1FlattopYesYes.223 REM
5.56 NATO
24 in.Stainless HBAR1:9NoNone
CR6720Colt Accurized RifleA2FF TubeS-1FlattopYesYes.223 REM
5.56 NATO
20 in.Stainless HBAR1:9NoNone
CRM16A1M16A1 Retro ReissueA1TriangularS-1A1YesNo5.56 NATO20 in.A11:12YesType 2 Duckbill
MT6400Match Target M44th GenerationM4S-1FlattopYesYes5.56 NATO16 in.M41:7NoNone
MT6400CMatch Target M44th GenerationM4S-1FlattopYesYes5.56 NATO16 in.M41:7NoFactory compensator
MT6430Match Target LightweightA2Short RibbedS-1A1NoYes9mm Luger16 in.A11:10NoNone
MT6530Match Target LightweightA2Short RibbedS-1A2YesYes5.56 NATO16 in.A11:7NoNone
MT6551Match Target RifleA2RibbedS-1A2YesYes5.56 NATO20 in.A21:7NoNone
MT6601Match Target HBARA2RibbedS-1A2YesYes5.56 NATO20 in.HBAR1:7NoNone
MT6601CMatch Target HBARA2RibbedS-1A2YesYes5.56 NATO20 in.HBAR1:7NoFactory compensator
MT6700Match Target Competition HBARA2RibbedS-1FlattopYesYes.223 REM
5.56 NATO
20 in.HBAR1:9NoNone
MT6700CMatch Target Competition HBARA2RibbedS-1FlattopYesNo.223 REM
5.56 NATO
20 in.HBAR1:9NoFactory compensator
MT6731Match Target Competition HBAR IIA2Short RibbedS-1FlattopYesYes.223 REM
5.56 NATO
16 in.HBAR1:9NoNone
MT6830AR-15A2 Government Carbine (Post-Ban LE Only)3rd GenerationShort RibbedS-1A2YesYes.223 REM16 in.HBAR1:12YesA2

LE series models[edit]

Colt model no.NameStockHand guardsFire controlRear sightForward assistCase deflectorCaliberBarrel lengthBarrel profileBarrel twistBayonet LugMuzzle device
LE1020Gas Piston Carbine4th GenerationRail SystemS-1FlattopYesYes5.56 NATO16 in.M41:7YesA2
LE1033Gas Piston Commando4th GenerationRail SystemS-1FlattopYesYes5.56 NATO11.5 in.A21:7YesA2
LE6920Law Enforcement Carbine (Also produced under license by Colt Canada)4th GenerationM4S-1FlattopYesYes5.56 NATO16 in.M41:7YesA2
LE6920HBLaw Enforcement Carbine4th GenerationM4S-1FlattopYesYes5.56 NATO16 in.M4 HBAR1:7YesA2
LE6921M4LE Carbine4th GenerationM4S-1FlattopYesYes5.56 NATO14.5 in.M41:7YesA2
LE6921CQBM4LE Carbine4th GenerationM4S-1FlattopYesYes5.56 NATO10.5 in.M4 HBAR1:7YesA2
LE6921HBM4LE Carbine4th GenerationM4S-1FlattopYesYes5.56 NATO14.5 in.M4 HBAR1:7YesA2
LE6921SPM4LE Carbine4th GenerationM4S-1FlattopYesYes5.56 NATO10 in.M4 HBAR1:7YesA2
LE6933M4LE Commando4th GenerationShort RibbedS-1FlattopYesYes5.56 NATO11.5 in.A21:7YesA2
LE6940Monolithic Advanced Law Enforcement Carbine4th GenerationMonolithic Rail SystemS-1FlattopYesYes5.56 NATO16 in.M41:7YesA2
LE6941Law Enforcement Carbine (direct impingement version of LE1020)4th GenerationRail SystemS-1FlattopYesYes5.56 NATO16 in.M41:7YesA2

LT series models[edit]

Colt model no.NameStockHand guardsFire controlRear sightForward assistCase deflectorCaliberBarrel lengthBarrel profileBarrel twistBayonet LugMuzzle device
LT6720-RTalo Special Edition4th GenerationRail SystemS-1FlattopYesYes5.56 NATO16 in.Lightweight pencil barrel1:7NoA2

Glossary of terms[edit]

Stock[edit]

Fixed Stocks

  • A1: Fixed stock as used on M16 and M16A1. May or may not have a trapdoor to store a cleaning kit
  • A2: Improved stock used on M16A2. Longer by 5/8'
  • Tubular: Fixed tubular buttstock, similar to the 2nd Generation retractable unit, using a receiver extension and triangular rear with buttplate

Retractable Stocks

  • 1st Generation: 2-position sliding stock that resembled a shortened fixed buttstock
  • 2nd Generation: 2-position aluminum retractable stock
  • 3rd Generation: 2-position fiberlite retractable stock. Introduced 1985
  • Canadian 3rd Generation: 4-position fiberlite retractable stock fitted with rubber buttpad
  • 4th Generation: 4-position nylon retractable stock. Introduced 2002, designed by Picatinny Arsenal engineer Lily Ko with reinforced ribs, an angled buttplate, and a rear sling swivel
  • Retractable ACR: Similar in design to the so-called 'Crane Stock' (initially fabricated by the Naval Surface Warfare Center Crane Division) essentially a 3rd generation unit with integrated cheek-rest
  • FPW Wire: Retractable wire stock similar in appearance to the stock used on the M3 submachine gun
  • Israeli: Rebuilt 3rd Generation stocks with 6 positions instead of 2

Handguards[edit]

  • Triangular: Triangular rifle handguards
  • Short Triangular: Carbine length triangular handguards
  • Round: Smooth round rifle handguards[citation needed]
  • Short Round: Carbine length smooth round handguard
  • Ribbed: Ribbed round rifle handguards
  • Short Ribbed: Carbine length ribbed handguards
  • Square LMG: Special heavy handguards with integral vertical grip for use during sustained fire
  • FF Tube: Free-Float Tube
  • M4: Oval carbine handguards with double heatshields
  • Rail System: Handguards are replaced with a Rail Integration System.
  • Monolithic Rail Platform (MRP): A variant Rail System made by LMT. It has a free-floating barrel for greater accuracy.

Fire control[edit]

  • S-1: The selector is Safe (S) – Semi-Automatic (1)
  • S-F: The selector is Safe (S) – Fully Automatic (F)
  • S-1-F: The selector is Safe (S) – Semi-Automatic (1) – Fully Automatic (F)
  • S-1–3: The selector is Safe (S) – Semi-Automatic (1) – 3-Round Limiter (3)
  • S-F-1–3: The selector is Safe (S) – Fully Automatic (F) – Semi-Automatic (1) – 3-Round Limiter (3). First Generation 4 position group
  • S-1–3-F: The selector is Safe (S) – Semi-Automatic (1) – 3-Round Limiter (3) – Fully Automatic (F). Second Generation 4 position group

Rear sight[edit]

Colt Ar 15 Post Ban Serial Numbers - Powerupmentor

  • A1: 'Field sights' in which the rear sight is only adjustable for windage
  • A2: Rear sight adjustable for both windage and elevation
  • Flattop: Indicates carry handle and rear sight has been replaced with a MIL-STD-1913 rail. A detachable carry handle can be attached to the rail which features either A1 (Diemaco/Colt Canada) or A2 (Colt) sights
  • Weaver: Indicates carry handle and rear sight has been replaced with a Weaver-type rail. A detachable carry handle can be attached to the rail which features either A1 (Diemaco/Colt Canada) or A2 (Colt) sights

Barrel Profile[edit]

  • ArmaLite Early ArmaLite AR-15 ultra-lightweight 'Hollywood' turned-down profile barrel, 1:14 twist only
  • A1: Also referred to as the 'lightweight' or 'pencil' profile. Government-specified barrel profile increased to between 0.675 and 0.575 inches
  • A2: Also referred to as the 'government' or 'gov't' profile. Barrel profile for which the portion of the barrel in front of handguards is thickened to 0.715 inches
  • HBAR: A barrel that in some portion is thicker than government-profile, usually underneath the handguards
  • M4: Government barrel profile with small portion reduced to 0.575 inches to mount M203 grenade launcher
  • M4 HBAR: M4 barrel with portion under handguard thickened for sustained automatic fire
  • Super Heavy: Special Colt bull target/match barrel
  • SFW: Special Forces Weapon profile, A2 profile with 'fat' portion forward of the sight triangle

Barrel twist[edit]

Note: Metric measurements are rounded upwards to the nearest digit.

  • 1:14: 1 right hand twist every 14 inches (356 mm) .222 Remington or .223 Remington (US M193)
  • 1:12: 1 right hand twist every 12 inches (305 mm) .223 Remington (US M193) or 7.62×39mm
  • 1:10: 1 right hand twist every 10 inches (254 mm) 9×19mm NATO
  • 1:9: 1 right hand twist every 9 inches (229 mm) .223 Remington & 5.56×45mm NATO
  • 1:7: 1 right hand twist every 7 inches (178 mm) 5.56×45mm NATO (NATO SS109 & US M855)

Muzzle device[edit]

Colt Ar Serial Number Lookup For Rifles

  • Type 1 Duckbill: Original three-prong flash hider
  • Type 2 Duckbill: Also referred to as 'three prong.' A larger three-prong flash hider
  • A1 or A1 Birdcage: Also referred to as Birdcage flash hider
  • A2 or A2 Compensator: Birdcage flash hider with bottom slots closed off to act as muzzle compensator and to prevent dust from being blown into the shooters face while in the prone position
  • 3.5' Moderator or 4.5' Moderator: Either the 3.5-inch or 4.5-inch baffled moderators
  • Conical: A conical flash suppressor
  • ACR Compensator: Special anti-rise muzzle device developed specifically for the Colt ACR
  • Factory Compensator: Colt Factory muzzle brake compliant with the restrictions of the 1994 Federal Assault Weapons Ban

References[edit]

  • Bartocci, Christopher R. (2004). Black Rifle II: The M16 into the 21st Century. Cobourg, Canada: Collector Grade Publications Inc. ISBN0-88935-348-4.
  • Dockery, Kevin. Special Warfare Special Weapons. Chicago, IL: Emperor's Press, 1997. ISBN1-883476-00-3.
  • Gervasi, Tom. Arsenal of Democracy III: America's War Machine, the Pursuit of Global Dominance. New York, NY: Grove Press, Inc, 1984. ISBN0-394-54102-2.
  • Long, Duncan. The Complete AR-15/M16 Sourcebook. Boulder, CO: Paladin Press, 2001. ISBN0-87364-687-8.
  • Stevens, R. Blake; Edward C. Ezell (2004) [1987]. The Black Rifle: M16 Retrospective. Modern U.S. Military Small Arms (Second Enhanced ed.). Cobourg, Canada: Collector Grade Publications Inc. ISBN0-88935-115-5.

See also[edit]

Bought A 'preban' AR15 Turned Out To Be Post Ban ...

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