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AR-15 and M16 Variant Info -

From Wikipedia, the free encyclopedia.

This article is a review of many variations of the AR-15 family of weapons. Weapons patterned on the original ArmaLite AR-15 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 of the platform. See Glossary of terms for an explanation of each column.

AR-15 and M16 Variants

Contents

1 Numbered Colt military models
2 Numbered Colt civilian models
2.1 R series models
2.2 AR series models
2.3 MT and CR series models
2.4 LE series models
3 Colt military models without model numbers4 Diemaco/Colt Canada models
4.1 Colt Canada model changes and comments
5 Non-factory military models
6 Glossary of terms
6.1 Stock
6.2 Fire control
6.3 Rear sight
6.4 Barrel Profile
6.5 Barrel twist
6.6 Handguards
6.7 Muzzle device
7 References
8 See also

 

Numbered Colt military models

Colt has been the most visible producer of weapons of the AR-15 pattern, and the military designation M16 is 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 model no,  Name,  Stock,  Fire control,  Rear sight,  Forward assist,  Case deflector,  Barrel length,  Barrel profile,  Barrel twist,  Hand guards,  Bayonet Lug,  Muzzle device.

601  AR-15  A1  S-1-F  A1  No  No  20 in.  A1  1:14 (early) or 1:12 (late)  Triangular  Yes  Type 1 Duckbill/Type 2 Duckbill.

602  AR-15  A1  S-1-F  A1  No  No  20 in.  A1  1:12  Triangular  Yes  Type 2 Duckbill.

603  XM16E1  A1  S-1-F  A1  Yes  No  20 in.  A1  1:12  Triangular  Yes  Type 2 Duckbill.

603  M16A1  A1  S-1-F  A1  Yes  No  20 in.  A1  1:12  Triangular  Yes  A1.

604  M16 (No XM16 designation)  A1  S-1-F  A1  No  No  20 in.  A1  1:12  Triangular  Yes  A1.

605  CAR-15 Carbine  A1  S-1-F  A1  No  No  15 in.  A1  1:12  Triangular  No  Type 2 Duckbill.

605A  CAR-15 Carbine  A1  S-1-F  A1  Yes  No  15 in.  A1  1:12  Triangular  No  Type 2 Duckbill.

605B  CAR-15 Carbine  A1  S-F-1-3  A1  No  No  15 in.  A1  1:12  Triangular  No  Type 2 Duckbill.

606  CAR-15 Heavy Assault Rifle M1  A1  S-1-F  A1  No  No  20 in.  HBAR  1:12  Triangular  Yes  Type 2 Duckbill.

606A  CAR-15 Heavy Assault Rifle M1  A1  S-1-F  A1  Yes  No  20 in.  HBAR  1:12  Triangular  Yes  Type 2 Duckbill.

606B  CAR-15 Heavy Assault Rifle M1  A1  S-F-1-3  A1  Yes  No  20 in.  HBAR  1:12  Triangular  Yes  Type 2 Duckbill.

607  CAR-15 SMG  1st Generation  S-1-F  A1  No  No  10 in.  A1  1:12  Short Triangular  No  Type 1 and 2 Duckbill and 3.5" Moderator.

607A  CAR-15 SMG  1st Generation  S-1-F  A1  Yes  No  10 in.  A1  1:12  Short Triangular  No  Type 1 and 2 Duckbill and 3.5" Moderator.

607B  CAR-15 SMG  1st Generation  S-F-1-3  A1  No  No  10 in.  A1  1:12  Short Triangular  No  Type 1 and 2 Duckbill and 3.5" Moderator.

608  CAR-15 Survival Rifle  Tubular  S-1-F  A1  No  No  10 in.  A1  1:12  Short Round  No  Conical or 3.5" Moderator.

609  XM177E1  2nd Generation  S-1-F  A1  Yes  No  10 in.  A1  1:12  Short Ribbed  No  3.5" or 4.5" Moderator.

610  XM177 or GAU-5/A  2nd Generation  S-1-F  A1  No  No  10 in.  A1  1:12  Short Ribbed  No  3.5" or 4.5" Moderator.

610B  CAR-15 SMG  2nd Generation  S-F-1-3  A1  No  No  10 in.  A1  1:12  Short Ribbed  No  3.5" or 4.5" Moderator.

611  M16 HBAR  A1  S-1-F  A1  Yes  No  20 in.  HBAR  1:12  Triangular  Yes  A1.

611P  M16 HBAR (License produced by Elisco Tools)  A1  S-1-F  A1  Yes  No  20 in.  HBAR  1:12  Triangular  Yes  A1.

613  M16  A1  S-1-F  A1  Yes  No  20 in.  A1  1:12  Triangular  Yes  A1.

613P  M16 (License produced by Elisco Tools)  A1  S-1-F  A1  Yes  No  20 in.  A1  1:12  Triangular  Yes  A1.

614  M16  A1  S-1-F  A1  No  No  20 in.  A1  1:12  Triangular  Yes  A1.

614S  M16S1 (License produced by Chartered Arms Singapore) A1 S-1-F A1 No  No  20 in.  A1  1:12  Triangular  Yes  A1.

615 M16 HBAR A1 S-1-F A1  No  No  20 in. HBAR 1:12  Triangular  Yes  A1.

616 M16 HBAR A1 S-1-F A1  No  No  20 in. HBAR 1:12  Triangular  Yes  A1.

619 XM177E1 2nd Generation S-1-F A1  Yes  No  10 in.  A1  1:12  Short Ribbed  No  3.5” or 4.5” Moderator.

620 CAR-15 2nd Generation S-1-F A1  No  No  10 in.  A1  1:12  Short Ribbed  No  3.5” or 4.5” Moderator.

621 M16A1 HBAR A1 S-1-F A1  Yes  No  20 in.  HBAR  1:12  Triangular  Yes A1.

629 XM177E2 2nd Generation S-1-F A1  Yes  No  11.5 in.  A1  1:12  Short Ribbed  No 4.5” Moderator.

630 GAU-5A/A 2nd Generation S-1-F A1  No  No  11.5 in.  A1  1:12  Short Ribbed  No 4.5” Moderator.

633 Colt SMG 2nd Generation S-1-F A1  No  Yes  7 in. A1 1:10  Short Round  No None.

634 Colt SMG 2nd Generation Conflict between S-1 and S-1-F A1  No Yes  10 in.  A1 1:10  Short Ribbed  No  A2.

635 Colt SMG 2nd, 3rd,or 4th Generation S-1-F A1  No  Yes  10 in.  A1  1:10  Short Ribbed  No  A2.

635S Colt SMG 2nd Generation S-1-F A1  No  Yes  10 in.  A1 w/ integral suppressor  1:10  Short Ribbed  No  A2.

639 XM177E2 2nd Generation S-1-F A1  Yes  No  11.5 in.  A1  1:12  Short Ribbed  No  4.5” Moderator or A1.

639 Colt SMG 2nd S-1-3 A1  No  Yes  10 in.  A1 w/integral suppressor  1:10  Short Ribbed  No  A2.

640 XM177E2 2nd Generation S-1-F A1  No  No  11.5 in.  A1  1:12  Short Ribbed  No 4.5” Moderator or A1.

645 M16A1E1/M16A2 A2 S-1-3 A2  Yes  Yes  20 in.  A2  1:7  Ribbed  Yes  A2.

645E M16A2E1 Flattop (w/flip downfront sight) S-1-3 A2  Yes  Yes  20 in.  A2  1:7  Ribbed  Yes  A2.

646 M16A2E3/M16A3 A2 S-1-F A2  Yes  Yes  20 in.  A2  1:7  Ribbed  Yes  A2.

649 GAU-5A/A 2nd Generation S-1-F A1  No  No  11.5 in.  A1  1:12  Short Ribbed  No  4.5” Moderator.

650 M16A1 carbine A1 S-1-F A1  Yes  No  14.5 in.  A1  1:12  Short Ribbed  Yes  A1.

651 M16A1 carbine A1 S-1-F A1  Yes  No  14.5 in.  A1  1:12  Short Ribbed  Yes  A1.

652 M16A1 carbine A1 S-1-F A1  No  No  14.5 in.  A1  1:12  Short Ribbed  Yes  A1.

653 M16A1 carbine 2nd Generation S-1-F A1  Yes  No  14.5 in.  A1  1:12  Short Ribbed  Yes  A1.

653P  M16A1 carbine (License produced by Elisco Tools)  2nd Generation  S-1-F  A1  Yes  No  14.5 in.  A1  1:12  Short Ribbed  Yes  A1.

654  M16A1 carbine  2nd Generation  S-1-F  A1  No  No  14.5 in.  A1  1:12  Short Ribbed  Yes  A1.

655  M16A1 Special High Profile  A1  S-1-F  A1 (used with special raised carry handle scope mount)  Yes  No  20 in.  HBAR  1:12  Triangular  Yes  A1.

656  M16A1 SpecialLow Profile  A1  S-1-F  Flattop  Yes  No  20 in.  HBAR  1:12  Triangular  Yes  A1.

701  M16A2  A2  S-1-F  A2  Yes  Yes  20 in.  A2  1:7  Ribbed  Yes  A2.

702  M16A2  A2  S-1-3  A2  Yes  Yes  20 in.  A2  1:7  Ribbed  Yes  A2.

703  M16A2  A2  S-1-F  A2  Yes  Yes  20 in.  A1  1:7  Ribbed  Yes  A2.

705  M16A2  A2  S-1-3  A2  Yes  Yes  20 in.  A2  1:7  Ribbed  Yes  A2.

707  M16A2  A2  S-1-3  A2  Yes  Yes  20 in.  A1  1:7  Ribbed  Yes  A2.

711  M16A2  A2  S-1-F  A1  Yes  No and Yes  20 in.  A1  1:7  Ribbed  Yes  A2.

713  M16A2  A2  S-1-3  A2  Yes  Yes  20 in.  A2  1:7  Ribbed  Yes  A2.

715  M16A2 (License produced by Diemaco/ColtCanada as the C7)  A2  S-1-F  A1  Yes  Yes  20 in.  A2  1:7  Ribbed  Yes  A2.

719  M16A2  A2  S-1-3  A2  Yes  Yes  20 in.  A1  1:7  Ribbed  Yes  A2.

720  XM4 Carbine  3rd Generation  S-1-3  A2  Yes  Yes  14.5 in.  M4  1:7  Short Ribbed  Yes  A2.

723  M16A2 carbine  3rd Generation  S-1-F  A1  Yes  Yes  14.5 in.  A1  1:7  Short Ribbed  Yes  A1.

725  M16A2 carbine (License produced by Diemaco/ColtCanada as the C8)  3rd Generation  S-1-F  A1  Yes  Yes  14.5 in.  A1  1:7  Short Ribbed  Yes  A2.

725A  M16A2 carbine  3rd Generation  S-1-F  A1  Yes  Yes  14.5 in.  A1  1:7  Short Ribbed  Yes  A2.

725B  M16A2 carbine  3rd Generation  S-1-F  A1  Yes  Yes  14.5 in.  A2  1:7  Short Ribbed  Yes  A2.

726  M16A2 carbine  3rd Generation  S-1-F  A1  Yes  Yes  14.5 in.  A1  1:7  Short Ribbed  Yes  A1.

727  M16A2 carbine  3rd Generation  S-1-F  A2  Yes  Yes  14.5 in.  M4  1:7  Short Ribbed  Yes  A2.

728  M16A2 carbine  3rd Generation  S-1-F  A2  Yes  Yes  14.5 in.  M4  1:7  Short Ribbed  Yes  A2.

733  M16A2 Commando/M4Commando  3rd or 4th Generation  S-1-F  A1 or A2  Yes  Yes or No  11.5 in.  A1 or A2  1:7  Short Ribbed  No  A1 or A2.

733A  M16A2 Commando/M4  3rd or 4th Generation  S-1-3  A1 or A2  Yes  Yes or No  11.5 in.  A1 or A2  1:7  Short Ribbed  No  A1 or A2.

734  M16A2 Commando  3rd Generation  S-1-F  A1 or A2  Yes  Yes or No  11.5 in.  A1 or A2  1:7  Short Ribbed  No  A1 or A2.

734A  M16A2 Commando  3rd Generation  S-1-3  A1 or A2  Yes  Yes or No  11.5 in.  A1 or A2  1:7  Short Ribbed  No  A1 or A2.

735  M16A2 Commando/M4Commando  3rd or 4th Generation  S-1-3  A1 or A2  Yes  Yes or No  11.5 in.  A1 or A2  1:7  Short Ribbed  No  A1 or A2.

737  M16A2  A2  S-1-3  A2  Yes  Yes  20 in.  HBAR  1:7  Ribbed  Yes  A2.

738  M4 Commando Enhanced  4th Generation  S-1-3-F  A2  Yes  Yes  11.5 in.  A2  1:7  Short Ribbed  No  A1 or A2.

741  M16A2  A2  S-1-F  A2  Yes  Yes  20 in.  HBAR  1:7  Ribbed  Yes  A2.

742  M16A2 (Standard w/ bipod)  A2  S-1-F  A2  Yes  Yes  20 in.  HBAR  1:7  Ribbed  Yes  A2.

745  M16A2 (Standard w/ bipod)  A2  S-1-3  A2  Yes  Yes  20 in.  HBAR  1:7  Ribbed  Yes  A2.

746  M16A2 (Standard w/ bipod)  A2  S-1-3  A2  Yes  Yes  20 in.  HBAR  1:7  Ribbed  Yes  A2.

750  LMG (Colt/Diemaco project)  A2  S-F  A2  Yes  Yes  20 in.  HBAR  1:7  SquareLMG  Yes  A2.

777  M4 Carbine  4th Generation  S-1-3  A2  Yes  Yes  14.5 in.  M4  1:7  M4  Yes  A2.

778  M4 Carbine Enhanced  4th Generation  S-1-3-F  A2  Yes  Yes  14.5 in.  M4  1:7  M4  Yes  A2.

779  M4 Carbine  4th Generation  S-1-F  A2  Yes  Yes  14.5 in.  M4  1:7  M4  Yes  A2.

901  M16A3  A2  S-1-F  Flattop  Yes  Yes  20 in.  A2  1:7  Ribbed  Yes  A2.

905  M16A3  A2  S-1-3  Flattop  Yes  Yes  20 in.  A2  1:7  Ribbed  Yes  A2.

920  M4 Carbine  3rd and 4th Generation  S-1-3  Flattop  Yes  Yes  14.5 in.  M4  1:7  M4  Yes  A2.

921  M4E1/A1Carbine  4th Generation  S-1-F  Flattop  Yes  Yes  14.5 in.  M4  1:7  M4  Yes  A2.

921HB  M4A1 Carbine  4th Generation  S-1-F  Flattop  Yes  Yes  14.5 in.  M4 HBAR  1:7  M4  Yes  A2.

925  M4E2 Carbine  3rd or 4th Generation  S-1-3  Flattop  Yes  Yes  14.5 in.  M4  1:7  M4  Yes  A2.

927  M4 Carbine  4th Generation  S-1-F  Flattop  Yes  Yes  14.5 in.  M4  1:7  M4  Yes  A2.

933  M4 Commando  4th Generation  S-1-F  Flattop  Yes  Yes  11.5 in.  A1 or A2  1:7  Short Ribbed  No  A2.

935  M4 Commando  4th Generation  S-1-3  Flattop  Yes  Yes  11.5 in.  A1 or A2  1:7  Short Ribbed  No  A2.

938  M4 Commando Enhanced  4th Generation  S-1-3-F  Flattop  Yes  Yes  11.5 in.  A2  1:7  M4  No  A2.

977  M4 Carbine  4th Generation  S-1-3  Flattop  Yes  Yes  14.5 in.  M4  1:7  M4  Yes  A2.

941  M16A3  A2  S-1-F  Flattop  Yes  Yes  20 in.  HBAR  1:7  Ribbed  Yes  A2.

942  M16A3 (Standard  w/ bipod)  A2  S-1-F  Flattop  Yes  Yes  20 in.  HBAR  1:7  Ribbed  Yes  A2.

945  M16A2E4/M16A4  A2  S-1-3  Flattop  Yes  Yes  20 in.  A2  1:7  Ribbed  Yes  A2.

950  LMG (Colt/Diemaco project)  A2  S-F  Flattop  Yes  Yes  20 in.  HBAR  1:7  Square LMG  Yes  A2.

978  M4 Carbine Enhanced  4th Generation  S-1-3-F  Flattop  Yes  Yes  14.5 in.  M4  1:7  M4  Yes  A2.

979  M4 Carbine  4th Generation  S-1-F  Flattop  Yes  Yes  14.5 in.  M4  1:7  M4  Yes  A2.

 

Numbered Colt civilian models

Colt’s civilian line 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” prefix. Currently, Colt Defense has no line targeted specifically at the private civilian market.

R series models

Colt model no.,  Name,  Stock,  Fire control,  Rear sight,  Forward assist, Case deflector, Barrel length, Barrel profile, Barrel twist,  Hand guards,  BayonetLug,  Muzzle device.

R6000  AR-15 Sporter (SP1)  A1  S-1  A1  No  No  20 in.  A1  1:12  Triangular Yes  Type 2 Duckbill or A1.

R6001  AR-15 Sporter Carbine (SP1 Carbine) 2nd Generation S-1  A1  No  No  16 in.  A1  1:12  Short Ribbed  Yes  A1  

R6002  AR-15 Sporter (SP1 Bundled with 3x scope)  A1  S-1  A1  No  No  20 in.  A1  1:12  Triangular Yes  A1.

R6003  AR-15 Sporter Carbine (SP1Carbine; Bundled with 3x scope)  2nd Generation S-1  A1  No  No  16 in.  A1  1:12  Short Ribbed  Yes  A1.

R6004  AR-15 Sporter (SP1 Bundled with Colt Reflex SightingSystem)  A1  S-1  A1  No  No  20 in.  A1  1:12  Triangular Yes  A1.

R6420  AR-15A2 Sporter II Carbine  3rd Generation S-1  A2  Yes  No  16 in.  A1  1:7  Short Ribbed  Yes  A2.

R6430  Sporter Lightweight (9 mm)  3rd Generation S-1  A1  No  No  16 in.  A1  1:10  Short Ribbed  Yes  A1.

R6450  AR-15 9 mm Carbine  3rd Generation  S-1  A1  No  No  16 in.  A1  1:10  Short Ribbed  Yes  A1.

R6500  AR-15A2 Sporter II  A2  S-1  A2  Yes  No  20 in.  A1  1:7  Short Ribbed  Yes  A2.

R6510  AR-15A2 Sporter II (Special export model in .222 Remington)  A2  S-1  A2  Yes  No  20 in.  A1  1:7  Short Ribbed  Yes  A2.

R6520  AR-15A2 Government Carbine  3rd Generation  S-1  A2  Yes  Yes  16 in.  A1  1:7  Short Ribbed  Yes  A2.

R6521  AR-15A2 Government Carbine (Special export model with receiver block and large pin upper receiver)  3rd Generation  S-1  A2  Yes  Yes  16 in.  A1  1:7  Short Ribbed  Yes  A2.

R6530  Sporter Lightweight  3rd Generation  S-1  A2  Yes  Yes  16 in.  A1  1:7  Short Ribbed  No  A2.

R6550  AR-15A2 Government  A2  S-1  A2  Yes  No  20 in.  A2  1:7  Ribbed  Yes  A2.

R6550CC  AR-15A2 Government (w/ factory camouflage finish)  A2  S-1  A2  Yes  No  20 in.  A2  1:7  Ribbed  Yes  A2.

R6550K  AR-15A2 Government (w/ factory installed .22 Long Rifle conversion kit)  A2  S-1  A2  Yes  No  20 in.  A2  1:7  Ribbed  Yes  A2.

R6551  Sporter Target  A2  S-1  A2  Yes  No  20 in.  A2  1:7  Ribbed  Yes  A2.

R6600  AR-15A2 HBAR  A2  S-1  A2  Yes  No  20 in.  HBAR  1:7  Ribbed  Yes  A2.

R6600DH  AR-15A2 Delta HBAR (bundled w/Tasco 3–9x scope and cheekpiece)  A2  S-1  A2  Yes  No  20 in.  HBAR  1:7  Ribbed  Yes  A2.

R6600K  AR-15A2 HBAR (w/factory  installed .22 Long Rifleconversion kit)  A2  S-1  A2  Yes  No  20 in.  HBAR  1:7  Ribbed  Yes  A2.

R6601 SporterMatch HBAR A2 S-1  A2  Yes  No  20 in.  HBAR  1:7  Ribbed  No  A2.

R6601DH SporterMatch Delta HBAR (bundled w/Tasco 3–9x scope and cheekpiece) A2 S-1 A2  Yes  No  20 in.  HBAR  1:7  Ribbed  No  A2.

R6700 Sporter Competition HBAR A2 S-1 Flattop  Yes  No  20 in.  HBAR  1:9  Ribbed  No  A2.

R6700CH Sporter Competition HBAR (bundled w/Tasco 3–9x scope and cheekpiece) A2 S-1  Flattop  Yes  No  20 in.  HBAR  1:9  Ribbed  No  A2.

R6700S Sporter Competition HBAR (bundled w/Tasco 3–9x scope) A2 S-1  Flattop  Yes  No  20 in.  HBAR  1:9  Ribbed  No  A2.

R6701 Sporter Competition HBAR (Special limited edition production run) A2 S-1 Flattop  Yes  Yes  20 in.  HBAR  1:9  Ribbed  No  A2.

R6721 AR-15A3 Tactical Carbine 4th Generation S-1  A2 Yes  Yes  16 in.  HBAR  1:9  Ribbed  Yes  A2.

R6724 Sporter CompetitionHBAR A2 S-1  Flattop  Yes  No  24 in.  HBAR  1:9  Ribbed  No  A2.

R6731 AR-15A3 CompetitionHBAR A2 S-1  Yes  Yes  16 in.  HBAR  1:9  Short Ribbed  No  A2.

R6750 Sporter Competition HBAR (bundled w/bipod) A2 S-1  A2 Yes  Yes  20 in.  Super Heavy  1:7  Ribbed  No  A2.

R6821 Sporter Carbine (7.62x39mm) 3rd Generation S-1  A2 Yes  Yes  16 in.  HBAR  1:12  Short Ribbed  No  A1.

R6831 Sporter Lightweight (7.62x39mm) 3rd Generation S-1  A2 Yes  Yes  16 in.  A1  1:12  Short Ribbed  No  A1.

AR series models

Colt model no,  Name,  Stock,  Fire control,  Rear sight,  Forward assist,  Case deflector,  Barrel length,  Barrel profile,  Barrel twist,  Hand guards,  Bayonet Lug,  Muzzle device.

AR6320  AR-15 Lightweight  3rd Generation  S-1  A1  Yes  Yes  20 in.  A2  1:9  Short Ribbed  No  A2.

AR6450  AR-15 9 mm Carbine  4th Generation  S-1  A1  No  No  16 in.  A2  1:10  Short Ribbed  Yes  A1.

AR6520  AR-15A2 Government Carbine  4th Generation  S-1  A2  Yes  Yes  16 in.  A2  1:7  Short Ribbed  Yes  A2.

AR6520SP  AR-15A2 Government Carbine  4th Generation  S-1  A2  Yes  Yes  10 in.  A2  1:7  Short Ribbed  Yes  A2.

AR6525  AR-15A2 Government Carbine  4th Generation  S-1  A2  Yes  Yes  16 in.  A2  1:9  Short Ribbed  Yes  A2.

AR6721  AR-15A3 Tactical Carbine  4th Generation  S-1  Flattop  Yes  Yes  16 in.  HBAR  1:9  Short Ribbed  Yes  A2.

AR6721SP  AR-15A3 Tactical Carbine  4th Generation  S-1  Flattop  Yes  Yes  10 in.  HBAR  1:9  Short Ribbed  Yes  A2.

MT and CR series models LE series models

Colt model no,  Name,  Stock,  Fire control,  Rear sight,  Forward assist,  Case deflector,  Barrel length,  Barrel profile,  Barrel twist,  Hand guards,  Bayonet Lug,  Muzzle device.

CR6724  Colt Accurized Rifle  A2  S-1  Flattop  Yes  Yes  24 in.  Stainless HBAR  1:9  FF Tube  No  None.

MT6400  Match Target M4  4th Generation  S-1  Flattop  Yes  Yes  16 in.  M4  1:7  M4  No  None.

MT6400C  Match Target M4  4th Generation  S-1  Flattop  Yes  Yes  16 in.  M4  1:7  M4  No  Factory compensator.

MT6530  Match Target Lightweight  A2  S-1  A2  Yes  Yes  16 in.  A1  1:7  Short Ribbed  No  None.

MT6551  Match Target Rifle  A2  S-1  A2  Yes  Yes  20 in.  A2  1:7  Ribbed  No  None.

MT6601  Match Target HBAR  A2  S-1  A2  Yes  Yes  20 in.  HBAR  1:7  Ribbed  No  None.

MT6601C  Match Target HBAR  A2  S-1  A2  Yes  Yes  20 in.  HBAR  1:7  Ribbed  No  Factory compensator.

MT6700  Match Target Competition HBAR  A2  S-1  Flattop  Yes  No  20 in.  HBAR  1:9  Ribbed  No  None.

MT6700C  Match Target  Competition  HBAR  A2  S-1  Flattop  Yes  No  20 in.  HBAR  1:9  Ribbed  No  Factory compensator.

MT6731  Match Target Competition HBAR II  A2  S-1  Flattop  Yes  Yes  16 in.  HBAR  1:9  Short Ribbed  No  None.

MT6830  AR-15A2 Government Carbine (Post-Ban LE Only)  3rd Generation  S-1  A2  Yes  Yes  16 in.  HBAR  1:12  Short Ribbed  Yes  A2.

Colt model no,  Name,  Stock,  Fire control,  Rear sight,  Forward assist,  Case deflector,  Barrel length,  Barrel profile,  Barrel twist,  Hand guards,  Bayonet Lug,  Muzzle device.

LE1020  Gas Piston Carbine  4th Generation  S-1  Flattop  Yes  Yes  16 in.  M4  1:7  Rail System  Yes  A2.

LE1033  Gas Piston Commando  4th Generation  S-1  Flattop  Yes  Yes  11.5 in.  A2  1:7  Rail System  Yes  A2.

LE6920  Law Enforcement Carbine (Also produced under license by Colt Canada)  4th Generation  S-1  Flattop  Yes  Yes  16 in.  M4  1:7  M4  Yes  A2.

LE6920HB  Law Enforcement Carbine  4th Generation  S-1  Flattop  Yes  Yes  16 in.  M4 HBAR  1:7  M4  Yes  A2.

LE6921  M4LE Carbine  4th Generation  S-1  Flattop  Yes  Yes  14.5 in.  M4  1:7  M4  Yes  A2.

LE6921CQB  M4LE Carbine  4th Generation  S-1  Flattop  Yes  Yes  10.5 in.  M4 HBAR  1:7  M4  Yes  A2.

LE6921HB  M4LE Carbine  4th Generation  S-1  Flattop  Yes  Yes  14.5 in.  M4 HBAR  1:7  M4  Yes  A2.

LE6921SP  M4LE Carbine  4th Generation  S-1  Flattop  Yes  Yes  10 in.  M4 HBAR  1:7  M4  Yes  A2.

LE6933  M4LE Commando  4th Generation  S-1  Flattop  Yes  Yes  11.5 in.  A2  1:7  Short Ribbed  Yes  A2.

LE6940  Monolithic Advanced Law Enforcement Carbine  4th Generation  S-1  Flattop  Yes  Yes  16 in.  M4  1:7  Monolithic Rail System  Yes  A2.

LE6941  Law Enforcement Carbine (direct impingement version of LE1020)  4th Generation  S-1  Flattop  Yes  Yes  16 in.  M4  1:7  Rail System  Yes  A2.

Colt military models without model numbers

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

Colt model no,  Name,  Stock,  Fire control,  Rear sight,  Forward assist,  Case deflector,  Barrel length,  Barrel profile,  Barrel twist,  Hand guards,  Bayonet Lug,  Muzzle device.

M16 PIP/M16A1E1  A2  S-1-F or S-1•3  A2  Yes  Yes  20 in.  A2  1:7  Ribbed  Yes  A1 or A2.

M16 ACR/M16A2E2  Retractable ACR  S-1-3  Flattop  Yes  Yes  20 in.  A2  1:7  ACR Type  No  ACR compensator.

XM231  FPW Wire  S-F  None  No  No  15.6 in.  A1  1:12  Short Round  No  A1.

M231  None  S-F  None  No  No  15.6 in.  A1  1:12  Short Round  No  A1.

Diemaco/Colt Canada models

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 model,  Stock,  Fire control,  Rear sight,  Forward assist,  Case deflector,  Barrel length,  Barrel profile,  Barrel twist,  Hand guards,  Bayonet Lug,  Muzzle device.  

715  C7  A2  S-1-F  A1  Yes  Yes  20 in.  A2  1:7  Ribbed  Yes  A2.

N/A  C7FT  A2  S-1-F  Weaver  Yes  Yes  20 in.  A2  1:7  Ribbed  Yes  A2.

N/A  C7A2  Canadian 3rd Generation  S-1-F  Weaver  Yes  Yes  20 in.  A2  1:7  Ribbed  Yes  A2.

750  Colt/Diemaco LMG/LSW  A2  S-F  A2  Yes  Yes  20 in.  HBAR  1:7  SquareLMG  No  A2.

N/A  LSW  A2  S-F  Weaver  Yes  Yes  20 in.  HBAR  1:7  SquareLMG  No  A2.

725  C8  3rd Generation  S-1-F  A1  Yes  Yes  14.5 in.  A1  1:7  Short Ribbed  Yes  A2.

N/A  C8FT  Canadian 3rd Generation  S-1-F  Weaver  Yes  Yes  14.5 in.  A1  1:7  Short Ribbed  Yes  A2.

N/A  C8FTHB  Canadian 3rd Generation  S-1-F  Weaver  Yes  Yes  14.5 in.  A2  1:7  Short Ribbed  Yes  A2.

N/A  SFW  Canadian 3rd Generation  S-1-F  Weaver  Yes  Yes  14.5 in.  SFW  1:7  Short Ribbed  Yes  A2.

N/A  C8CQB  Canadian 3rd Generation  S-1-F  Weaver  Yes  Yes  10" in.  A2  1:7  Short Ribbed  Yes  A2.

N/A  PDW  Canadian 3rd  S-1-F  Weaver  Yes  Yes  5.7" in.  A2  1:7  N/A  No  A2.

Colt Canada model changes and comments

When Diemaco became Colt Canada the marketing names for a number of products were changed, though some remained the same. Those that changed are listed below, with comments on what major changes Colt Canada made the models.

Diemaco model,  Colt Canada model,  Comments

C7FT  C7A1  Colt Canada offers this rifle with either a Weaver or MIL-STD-1913 rail type sight base.

LSW  LSW  Colt Canada offers this rifle with either a Weaver or MIL-STD-1913 rail type sight base.

C8FT  C8A1  Colt Canada offers this rifle with either a Weaver or MIL-STD-1913 rail type sight base.

C8FTHB  C8A2  Colt Canada offers this rifle with either a Weaver or MIL-STD-1913 rail type sight base.

SFW  SFW  Colt Canada offers this rifle with either a Weaver or MIL-STD-1913 rail type sight base.

C8CQB  CQB  Colt Canada offers this rifle with either a Weaver or MIL-STD-1913 rail type sight base.

Non-factory military models

Name,  Base weapon,  Stock,  Fire control,  Rear sight,  Forward assist,  Case deflector,  Barrel length,  Barrel profile,  Barrel twist,  Hand guards,  Bayonet Lug,  Muzzle device.

GUU-5/P  GAU-5/A or GAU-5A/A  2nd or 3rd Generation  S-1-F  A1  Yes  No  14.5 in.  A1 or M4  1:7  Short Ribbed  Yes  A1 or A2.

GUU-5/P  GAU-5/A or GAU-5A/A  2nd or 3rd Generation  S-1-F  A2 or Flattop  Yes  Yes  14.5 in.  M4  1:7  M4  Yes  A2.

Mekut'zar  Model 653  3rd Generation or Israeli  S-1-F  A1  Yes  No  14.5 in.  M4  1:7  Short Ribbed  Yes  A2.

Mekut'zrar  Model 653  2nd Generation or Israeli  S-1-F  A1  Yes  No  Variable; 9" average  A1  1:12  Short Ribbed  No  Various.

 

Glossary of terms

Stocks

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.

 

Fire control

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 

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

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

1:14: 1 right hand twist every 14 inches.

1:12: 1 right hand twist every 12 inches (305 mm).

1:10: 1 right hand twist every 10 inches.

1:9: 1 right hand twist every 9 inches.

1:7: 1 right hand twist every 7 inches (177.8 mm).

 

Handguards

Triangular: Triangular rifle handguards.

Short Triangular: Carbine length triangular handguards.

Round: Smooth round rifle handguards.

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.

 

Muzzle device

Type 1 Duckbill: Original three-prong flash hider.

Type 2 Duckbill: Also referred to as "three prong." A larger three-prong flash hider.

A1: Also referred to as the "Birdcage" flash hider.

A2: 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

Bartocci, Christopher R. (2004). Black Rifle II: The M16 into the 21st Century. Cobourg, Canada: 

Collector Grade Publications Inc.. ISBN 0-88935-348-4.

Dockery, Kevin. Special Warfare Special Weapons. Chicago, IL: Emperor's Press, 1997. ISBN 1-883•

47600-3.

Gervasi, Tom. Arsenal of Democracy III: America's War Machine, the Pursuit of Global Dominance. 

New York, NY: Grove Press, Inc, 1984. ISBN 0-394-54102-2.

Long, Duncan. The Complete AR-15/M16 Sourcebook. Boulder, CO: Paladin Press, 2001. ISBN 0•

87364-687-8.

Stevens, R. Blake; Edward C. Ezell (2004) [1987]. The Black Rifle: M16 Retrospective. Modern U.S. 

Military Small Arms (Second Enhanced Edition ed.). Cobourg, Canada: Colector Grade Publications

Inc.. ISBN 0-88935-115-5.

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