List of Colt AR-15 and M16 rifle variants
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 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.
Colt military models
Colt has been the most visible producer of ArmaLite AR-15 pattern weapons, and the military designations M16 and 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
The original Armalite AR-15 have the charging handle located on top of the upper receiver, protected within the carrying handle.| Colt model no. | Name | Stock | Hand guards | Fire control | Rear sight | Forward assist | Case deflector | Caliber | Barrel length | Barrel profile | Barrel twist | Bayonet Lug | Muzzle device |
| 601 | ArmaLite AR-15 | A1 | Triangular | S-1-F | A1 | No | No | .222 REM | 20 in. | A1 | 1:14 1:12 | Yes | Type 1 Duckbill Type 2 Duckbill |
| 602 | ArmaLite AR-15 | A1 | Triangular | S-1-F | A1 | No | No | .223 REM | 20 in. | A1 | 1:12 | Yes | Type 2 Duckbill |
Colt M16 rifle based weapons
| Colt model no. | Name | Stock | Hand guards | Fire control | Rear sight | Forward assist | Case deflector | Caliber | Barrel length | Barrel profile | Barrel twist | Bayonet Lug | Muzzle device |
| 603 | M16A1 | A1 | Triangular | S-1-F | A1 | Yes | No | .223 REM | 20 in. | A1 | 1:12 | Yes | Type 2 Duckbill or A1 Birdcage |
| 604 | M16 rifle | A1 | Triangular | S-1-F | A1 | No | No | .223 REM | 20 in. | A1 | 1:12 | Yes | A1 Birdcage |
| 605 | CAR-15 Carbine | A1 | Triangular | S-1-F | A1 | No | No | .223 REM | 15 in. | A1 | 1:12 | No | Type 2 Duckbill |
| 605A | CAR-15 Carbine | A1 | Triangular | S-1-F | A1 | Yes | No | .223 REM | 15 in. | A1 | 1:12 | No | Type 2 Duckbill |
| 605B | CAR-15 Carbine | A1 | Triangular | S-F-1-3 | A1 | No | No | .223 REM | 15 in. | A1 | 1:12 | No | Type 2 Duckbill |
| 606 | CAR-15 Heavy Assault Rifle M1 | A1 | Triangular | S-1-F | A1 | No | No | .223 REM | 20 in. | HBAR | 1:12 | Yes | Type 2 Duckbill |
| 606A | CAR-15 Heavy Assault Rifle M1 | A1 | Triangular | S-1-F | A1 | Yes | No | .223 REM | 20 in. | HBAR | 1:12 | Yes | Type 2 Duckbill |
| 606B | CAR-15 Heavy Assault Rifle M1 | A1 | Triangular | S-F-1-3 | A1 | Yes | No | .223 REM | 20 in. | HBAR | 1:12 | Yes | Type 2 Duckbill |
| 607 | CAR-15 SMG | 1st Generation | Short Triangular | S-1-F | A1 | No | No | .223 REM | 10 in. | A1 | 1:12 | No | Type 1 and 2 Duckbill and 3.5" Moderator |
| 607A | CAR-15 SMG | 1st Generation | Short Triangular | S-1-F | A1 | Yes | No | .223 REM | 10 in. | A1 | 1:12 | No | Type 1 and 2 Duckbill and 3.5" Moderator |
| 607B | CAR-15 SMG | 1st Generation | Short Triangular | S-F-1-3 | A1 | No | No | .223 REM | 10 in. | A1 | 1:12 | No | Type 1 and 2 Duckbill and 3.5" Moderator |
| 608 | CAR-15 Survival Rifle | Tubular | Short Round | S-1-F | A1 | No | No | .223 REM | 10 in. | A1 | 1:12 | No | Conical or 3.5" Moderator |
| 609 | Commando | 2nd Generation | Short Ribbed | S-1-F | A1 | Yes | No | .223 REM | 10 in. | A1 | 1:12 | No | 3.5" or 4.5" Moderator |
| 610 | Commando | 2nd Generation | Short Ribbed | S-1-F | A1 | No | No | .223 REM | 10 in. | A1 | 1:12 | No | 3.5" or 4.5" Moderator |
| 610B | CAR-15 SMG | 2nd Generation | Short Ribbed | S-F-1-3 | A1 | No | No | .223 REM | 10 in. | A1 | 1:12 | No | 3.5" or 4.5" Moderator |
| 611 | M16 HBAR | A1 | Triangular | S-1-F | A1 | Yes | No | .223 REM | 20 in. | HBAR | 1:12 | Yes | A1 Birdcage |
| 611P | M16 HBAR | A1 | Triangular | S-1-F | A1 | Yes | No | .223 REM | 20 in. | HBAR | 1:12 | Yes | A1 Birdcage |
| 613K | M16 | A1 | Triangular | S-1-F | A1 | Yes | No | .223 REM | 20 in. | A1 | 1:12 | Yes | A1 Birdcage |
| 613P | M16 | A1 | Triangular | S-1-F | A1 | Yes | No | .223 REM | 20 in. | A1 | 1:12 | Yes | A1 Birdcage |
| 614 | M16 | A1 | Triangular | S-1-F | A1 | No | No | .223 REM | 20 in. | A1 | 1:12 | Yes | A1 Birdcage |
| 614S | M16S1 | A1 | Triangular | S-1-F | A1 | No | No | .223 REM | 20 in. | A1 | 1:12 | Yes | A1 Birdcage |
| 615 | M16 HBAR | A1 | Triangular | S-1-F | A1 | No | No | .223 REM | 20 in. | HBAR | 1:12 | Yes | A1 Birdcage |
| 616 | M16 HBAR | A1 | Round | S-1-F | A1 | No | No | .223 REM | 20 in. | HBAR | 1:12 | Yes | A1 Birdcage |
| 619 | Commando | 2nd Generation | Short Ribbed | S-1-F | A1 | Yes | No | .223 REM | 10 in. | A1 | 1:12 | No | 3.5" or 4.5" Moderator |
| 620 | Commando | 2nd Generation | Short Ribbed | S-1-F | A1 | No | No | .223 REM | 10 in. | A1 | 1:12 | No | 3.5" or 4.5" Moderator |
| 621 | M16A1 HBAR | A1 | Triangular | S-1-F | A1 | Yes | No | .223 REM | 20 in. | HBAR | 1:12 | Yes | A1 Birdcage |
| 629 | Commando | 2nd Generation | Short Ribbed | S-1-F | A1 | Yes | No | .223 REM | 11.5 in. | A1 | 1:12 | No | 4.5" Moderator |
| 630 | Commando | 2nd Generation | Short Ribbed | S-1-F | A1 | No | No | .223 REM | 11.5 in. | A1 | 1:12 | No | 4.5" Moderator |
| 633 | Colt SMG | 2nd Generation | Short Round | S-1-F | A1 | No | Yes | 9mm NATO | 7 in. | A1 | 1:10 | No | - |
| 634 | Colt SMG | 2nd Generation | Short Ribbed | Conflict between S-1 and S-1-F | A1 | No | Yes | 9mm NATO | 10 in. | A1 | 1:10 | No | A1 Birdcage |
| 635 | Colt SMG | 2nd, 3rd, or 4th Generation | Short Ribbed | S-1-F | A1 | No | Yes | 9mm NATO | 10 in. | A1 | 1:10 | No | A1 Birdcage |
| 635S | Colt SMG | 2nd Generation | Short Ribbed | S-1-F | A1 | No | Yes | 9mm NATO | 10 in. | A1 w/ integral silencer | 1:10 | No | - |
| 639 | Commando | 2nd Generation | Short Ribbed | S-1-F | A1 | Yes | No | .223 REM | 11.5 in. | A1 | 1:12 | No | 4.5" Moderator or A1 |
| 639 | Colt SMG | 2nd | Short Ribbed | S-1-3 | A1 | No | Yes | 9mm NATO | 10 in. | A1 w/ integral silencer | 1:10 | No | A2 Compensator |
| 640 | Commando | 2nd Generation | Short Ribbed | S-1-F | A1 | No | No | .223 REM | 11.5 in. | A1 | 1:12 | No | 4.5" Moderator or A1 |
| 645 | M16A1E1/M16A2 | A2 | Ribbed | S-1-3 | A2 | Yes | Yes | 5.56 NATO | 20 in. | A2 | 1:7 | Yes | A2 Compensator |
| 645E | M16A2E1 | A2 | Ribbed | S-1-3 | Flattop | Yes | Yes | 5.56 NATO | 20 in. | A2 | 1:7 | Yes | A2 Compensator |
| 646 | M16A2E3/M16A3 | A2 | Ribbed | S-1-F | A2 | Yes | Yes | 5.56 NATO | 20 in. | A2 | 1:7 | Yes | A2 Compensator |
| 649 | Commando | 2nd Generation | Short Ribbed | S-1-F | A1 | No | No | .223 REM | 11.5 in. | A1 | 1:12 | No | 4.5" Moderator |
| 650 | M16A1 carbine | A1 | Short Ribbed | S-1-F | A1 | Yes | No | .223 REM | 14.5 in. | A1 | 1:12 | Yes | A1 Birdcage |
| 651 | M16A1 carbine | A1 | Short Ribbed | S-1-F | A1 | Yes | No | .223 REM | 14.5 in. | A1 | 1:12 | Yes | A1 Birdcage |
| 652 | M16A1 carbine | A1 | Short Ribbed | S-1-F | A1 | No | No | .223 REM | 14.5 in. | A1 | 1:12 | Yes | A1 Birdcage |
| 653 | M16A1 carbine | 2nd Generation | Short Ribbed | S-1-F | A1 | Yes | No | .223 REM | 14.5 in. | A1 | 1:12 | Yes | A1 Birdcage |
| 653P | M16A1 carbine | 2nd Generation | Short Ribbed | S-1-F | A1 | Yes | No | .223 REM | 14.5 in. | A1 | 1:12 | Yes | A1 Birdcage |
| 654 | M16A1 carbine | 2nd Generation | Short Ribbed | S-1-F | A1 | No | No | .223 REM | 14.5 in. | A1 | 1:12 | Yes | A1 Birdcage |
| 655 | M16A1 Special High Profile | A1 | Triangular | S-1-F | A1 | Yes | No | .223 REM | 20 in. | HBAR | 1:12 | Yes | A1 |
| 656 | M16A1 Special Low Profile | A1 | Triangular | S-1-F | Flattop | Yes | No | .223 REM | 20 in. | HBAR | 1:12 | Yes | A1 Birdcage |
| 701 | M16A2 | A2 | Ribbed | S-1-F | A2 | Yes | Yes | 5.56 NATO | 20 in. | A2 | 1:7 | Yes | A2 Compensator |
| 702 | M16A2 | A2 | Ribbed | S-1-3 | A2 | Yes | Yes | 5.56 NATO | 20 in. | A2 | 1:7 | Yes | A2 Compensator |
| 703 | M16A2 | A2 | Ribbed | S-1-F | A2 | Yes | Yes | 5.56 NATO | 20 in. | A1 | 1:7 | Yes | A2 Compensator |
| 705 | M16A2 | A2 | Ribbed | S-1-3 | A2 | Yes | Yes | 5.56 NATO | 20 in. | A2 | 1:7 | Yes | A2 Compensator |
| 707 | M16A2 | A2 | Ribbed | S-1-3 | A2 | Yes | Yes | 5.56 NATO | 20 in. | A1 | 1:7 | Yes | A2 Compensator |
| 711 | M16A2 | A2 | Ribbed | S-1-F | A1 | Yes | No and Yes | 5.56 NATO | 20 in. | A1 | 1:7 | Yes | A2 Compensator |
| 713 | M16A2 | A2 | Ribbed | S-1-3 | A2 | Yes | Yes | 5.56 NATO | 20 in. | A2 | 1:7 | Yes | A2 Compensator |
| 715 | M16A2 | A2 | Ribbed | S-1-F | A1 | Yes | Yes | 5.56 NATO | 20 in. | A2 | 1:7 | Yes | A2 Compensator |
| 719 | M16A2 | A2 | Ribbed | S-1-3 | A2 | Yes | Yes | 5.56 NATO | 20 in. | A1 | 1:7 | Yes | A2 Compensator |
| 720 | XM4 Carbine | Earlier 2nd Generation, Later 3rd Generation | Short Ribbed | Earlier S-1-F, Later S-1-3 | A1 or A2 | Earlier No, Later Yes | Earlier No, Later Yes | 5.56 NATO | Earlier 11.5 in., Later 14.5 in. | Earlier A1, Later M4 | 1:7 | Yes | Earlier A1, Later A2 Compensator |
| 725 | M16A2 carbine | 3rd Generation | Short Ribbed | S-1-F | A1 | Yes | Yes | 5.56 NATO | 14.5 in. | A1 | 1:7 | Yes | A2 Compensator |
| 725A | M16A2 carbine | 3rd Generation | Short Ribbed | S-1-F | A1 | Yes | Yes | 5.56 NATO | 14.5 in. | A1 | 1:7 | Yes | A2 Compensator |
| 725B | M16A2 carbine | 3rd Generation | Short Ribbed | S-1-F | A1 | Yes | Yes | 5.56 NATO | 14.5 in. | A2 | 1:7 | Yes | A2 Compensator |
| 726 | M16A2 carbine | 3rd Generation | Short Ribbed | S-1-F | A1 | Yes | Yes | 5.56 NATO | 14.5 in. | A1 | 1:7 | Yes | A1 Birdcage |
| 727 | M16A2 Government Carbine | 3rd Generation | Short Ribbed | S-1-F | A2 | Yes | Yes | 5.56 NATO | 14.5 in. | M4 | 1:7 | Yes | A2 Compensator |
| 728 | M16A2 carbine | 3rd Generation | Short Ribbed | S-1-F | A2 | Yes | Yes | 5.56 NATO | 14.5 in. | M4 | 1:7 | Yes | A2 Compensator |
| 733 | M16A2 Commando | 3rd or 4th Generation | Short Ribbed | S-1-F | A1 or A2 | Yes | Yes or No | 5.56 NATO | 11.5 in. | A1 or A2 | 1:7 | No | A1 or A2 |
| 733A | M16A2 Commando | 3rd or 4th Generation | Short Ribbed | S-1-3 | A1 or A2 | Yes | Yes or No | 5.56 NATO | 11.5 in. | A1 or A2 | 1:7 | No | A1 or A2 |
| 734 | M16A2 Commando | 3rd Generation | Short Ribbed | S-1-F | A1 or A2 | Yes | Yes or No | 5.56 NATO | 11.5 in. | A1 or A2 | 1:7 | No | A1 or A2 |
| 734A | M16A2 Commando | 3rd Generation | Short Ribbed | S-1-3 | A1 or A2 | Yes | Yes or No | 5.56 NATO | 11.5 in. | A1 or A2 | 1:7 | No | A1 or A2 |
| 735 | M16A2 Commando | 3rd or 4th Generation | Short Ribbed | S-1-3 | A1 or A2 | Yes | Yes or No | 5.56 NATO | 11.5 in. | A1 or A2 | 1:7 | No | A1 or A2 |
| 737 | M16A2 | A2 | Ribbed | S-1-3 | A2 | Yes | Yes | 5.56 NATO | 20 in. | HBAR | 1:7 | Yes | A2 |
| 738 | M4 Commando Enhanced | 4th Generation | Short Ribbed | S-1-3-F | A2 | Yes | Yes | 5.56 NATO | 11.5 in. | A2 | 1:7 | No | A1 or A2 |
| 741 | M16A2 | A2 | Ribbed | S-1-F | A2 | Yes | Yes | 5.56 NATO | 20 in. | HBAR | 1:7 | Yes | A2 |
| 742 | M16A2 | A2 | Ribbed | S-1-F | A2 | Yes | Yes | 5.56 NATO | 20 in. | HBAR | 1:7 | Yes | A2 |
| 745 | M16A2 | A2 | Ribbed | S-1-3 | A2 | Yes | Yes | 5.56 NATO | 20 in. | HBAR | 1:7 | Yes | A2 |
| 746 | M16A2 | A2 | Ribbed | S-1-3 | A2 | Yes | Yes | 5.56 NATO | 20 in. | HBAR | 1:7 | Yes | A2 |
| 750 | Colt Automatic Rifle | A2 | Square LMG | S-F | A2 | Yes | Yes | 5.56 NATO | 20 in. | HBAR | 1:7 | Yes | A2 |
| 777 | M4 Carbine | 4th Generation | M4 | S-1-F | A2 | Yes | Yes | 5.56 NATO | 14.5 in. | M4 | 1:7 | Yes | A2 |
| 778 | M4 Carbine Enhanced | 4th Generation | M4 | S-1-3-F | A2 | Yes | Yes | 5.56 NATO | 14.5 in. | M4 | 1:7 | Yes | A2 |
| 779 | M4 Carbine | 4th Generation | M4 | S-1-3 | A2 | Yes | Yes | 5.56 NATO | 14.5 in. | M4 | 1:7 | Yes | A2 |
| 901 | M16A2 | A2 | Ribbed | S-1-F | Flattop | Yes | Yes | 5.56 NATO | 20 in. | A2 | 1:7 | Yes | A2 |
| 905 | M16A2 | A2 | Ribbed | S-1-3 | Flattop | Yes | Yes | 5.56 NATO | 20 in. | A2 | 1:7 | Yes | A2 |
| 920 | M4 Carbine | 3rd and 4th Generation | M4 | S-1-3 | Flattop | Yes | Yes | 5.56 NATO | 14.5 in. | M4 | 1:7 | Yes | A2 |
| 921 | M4E1/A1 Carbine | 4th Generation | M4 | S-1-F | Flattop | Yes | Yes | 5.56 NATO | 14.5 in. | M4 | 1:7 | Yes | A2 |
| 921HB | M4A1 Carbine | 4th Generation | M4 | S-1-F | Flattop | Yes | Yes | 5.56 NATO | 14.5 in. | M4 HBAR | 1:7 | Yes | A2 |
| 925 | M4E2 Carbine | 3rd or 4th Generation | M4 | S-1-3 | Flattop | Yes | Yes | 5.56 NATO | 14.5 in. | M4 | 1:7 | Yes | A2 |
| 927 | M4 Carbine | 4th Generation | M4 | S-1-F | Flattop | Yes | Yes | 5.56 NATO | 14.5 in. | M4 | 1:7 | Yes | A2 |
| 933 | M4 Commando | 4th Generation | Short Ribbed | S-1-F | Flattop | Yes | Yes | 5.56 NATO | 11.5 in. | A1 or A2 | 1:7 | No | A2 |
| 935 | M4 Commando | 4th Generation | Short Ribbed | S-1-3 | Flattop | Yes | Yes | 5.56 NATO | 11.5 in. | A1 or A2 | 1:7 | No | A2 |
| 938 | M4 Commando Enhanced | 4th Generation | M4 | S-1-3-F | Flattop | Yes | Yes | 5.56 NATO | 11.5 in. | A2 | 1:7 | No | A2 |
| 941 | M16A3 | A2 | Ribbed | S-1-F | Flattop | Yes | Yes | 5.56 NATO | 20 in. | HBAR | 1:7 | Yes | A2 |
| 942 | M16A3 | A2 | Ribbed | S-1-F | Flattop | Yes | Yes | 5.56 NATO | 20 in. | HBAR | 1:7 | Yes | A2 |
| 945 | M16A2E4/M16A4 | A2 | Ribbed | S-1-3 | Flattop | Yes | Yes | 5.56 NATO | 20 in. | A2 | 1:7 | Yes | A2 |
| 950 | Colt Automatic Rifle | A2 | Square LMG | S-F | Flattop | Yes | Yes | 5.56 NATO | 20 in. | HBAR | 1:7 | Yes | A2 |
| 977 | M4 Carbine | 4th Generation | M4 | S-1-F | Flattop | Yes | Yes | 5.56 NATO | 14.5 in. | M4 | 1:7 | Yes | A2 |
| 978 | M4 Carbine Enhanced | 4th Generation | M4 | S-1-3-F | Flattop | Yes | Yes | 5.56 NATO | 14.5 in. | M4 | 1:7 | Yes | A2 |
| 979 | M4A1 Carbine | 4th Generation | M4 | S-1-3 | Flattop | Yes | Yes | 5.56 NATO | 14.5 in. | M4 | 1:7 | Yes | A2 |
| 991 | Colt SMG | 4th Generation | Short Ribbed | S-1-F | Flattop | No | Yes | 9mm NATO | 10.5 in. | A1 | 1:10 | No | A1 Birdcage |
| 992 | Colt SMG | 4th Generation | Short Ribbed | S-1-3 | Flattop | No | Yes | 9mm NATO | 10.5 in. | A1 | 1:10 | No | A1 Birdcage |
| Colt model no. | Name | Stock | Hand guards | Fire control | Rear sight | Forward assist | Case deflector | Caliber | Barrel length | Barrel profile | Barrel twist | Bayonet Lug | Muzzle device |
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.| Name | Stock | Hand guards | Fire control | Rear sight | Forward assist | Case deflector | Caliber | Barrel length | Barrel profile | Barrel twist | Bayonet Lug | Muzzle device |
| M16 PIP/M16A1E1 | A2 | Ribbed | S-1-F or S-1-3 | A2 | Yes | Yes | 5.56 NATO | 20 in. | A2 | 1:7 | Yes | A1 or A2 |
| M16 ACR/M16A2E2 | Retractable ACR | ACR Type | S-1-3 | Flattop | Yes | Yes | 5.56 NATO | 20 in. | A2 | 1:7 | No | ACR compensator |
| XM231 FPW | FPW Wire | Short Round | S-F | - | No | No | .223 REM | 15.6 in. | HBAR | 1:12 | No | A1 |
| M231 FPW | - | Short Round | S-F | - | No | No | .233 REM | 15.6 in. | HBAR | 1:12 | No | A1 |
Diemaco/Colt Canada models
The Canadian company Colt Canada licensed production of a rifle and carbine, 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 | Hand guards | Fire control | Rear sight | Forward assist | Case deflector | Caliber | Barrel length | Barrel profile | Barrel twist | Bayonet Lug | Muzzle device |
| 715 | C7 | A2 | Ribbed | S-1-F | A1 | Yes | Yes | 5.56 NATO | 20 in. | A2 | 1:7 | Yes | A2 |
| N/A | C7A1 | A2 | Ribbed | S-1-F | Weaver | Yes | Yes | 5.56 NATO | 20 in. | A2 | 1:7 | Yes | A2 |
| N/A | C7A2 | Canadian 3rd Generation | Ribbed | S-1-F | Weaver | Yes | Yes | 5.56 NATO | 20 in. | A2 | 1:7 | Yes | A2 |
| 750 | Colt/Diemaco LMG/LSW | A2 | Square LMG | S-F | A2 | Yes | Yes | 5.56 NATO | 20 in. | HBAR | 1:7 | No | A2 |
| N/A | LSW | A2 | Square LMG | S-F | Weaver | Yes | Yes | 5.56 NATO | 20 in. | HBAR | 1:7 | No | A2 |
| 725 | C8 | 3rd Generation | Short Ribbed | S-1-F | A1 | Yes | Yes | 5.56 NATO | 14.5 in. | A1 | 1:7 | Yes | A2 |
| N/A | C8A1 | Canadian 3rd Generation | Short Ribbed | S-1-F | Weaver | Yes | Yes | 5.56 NATO | 14.5 in. | A1 | 1:7 | Yes | A2 |
| N/A | C8FTHB | Canadian 3rd Generation | Short Ribbed | S-1-F | Weaver | Yes | Yes | 5.56 NATO | 14.5 in. | A2 | 1:7 | Yes | A2 |
| N/A | SFW | Canadian 3rd Generation | Short Ribbed | S-1-F | Weaver | Yes | Yes | 5.56 NATO | 16 in. | SFW | 1:7 | Yes | A2 |
| N/A | C8CQB | Canadian 3rd Generation | Short Ribbed | S-1-F | Weaver | Yes | Yes | 5.56 NATO | 10 in. | A2 | 1:7 | Yes | A2 |
| N/A | PDW | Canadian 3rd Generation | N/A | S-1-F | Weaver | Yes | Yes | 5.56 NATO | 5.7" in. | A2 | 1:7 | No | A2 |
Non-factory military models
Colt civilian models
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
| Colt model no. | Name | Stock | Hand guards | Fire control | Rear sight | Forward assist | Case deflector | Caliber | Barrel length | Barrel profile | Barrel twist | Bayonet Lug | Muzzle device |
| R6000 | AR-15 Sporter | A1 | Triangular | S-1 | A1 | No | No | .223 REM | 20 in. | A1 | 1:12 | Yes | Type 2 Duckbill or A1 |
| R6001 | AR-15 Sporter Carbine | 2nd Generation | Short Ribbed | S-1 | A1 | No | No | .223 REM | 16 in. | A1 | 1:12 | Yes | A1 |
| R6002 | AR-15 Sporter | A1 | Triangular | S-1 | A1 | No | No | .223 REM | 20 in. | A1 | 1:12 | Yes | A1 |
| R6003 | AR-15 Sporter Carbine | 2nd Generation | Short Ribbed | S-1 | A1 | No | No | .223 REM | 16 in. | A1 | 1:12 | Yes | A1 |
| R6004 | AR-15 Sporter | A1 | Triangular | S-1 | A1 | No | No | .223 REM | 20 in. | A1 | 1:12 | Yes | A1 |
| R6007 | AR-15 Sporter | A1 | Triangular | S-1 | A1 | No | No | .223 REM | 20 in. | A1 | 1:12 | Yes | A1 |
| R6010 | AR-15 Sporter | A1 | Triangular | S-1 | A1 | No | No | .222 REM | 20 in. | A1 | 1:12 | Yes | A1 |
| R6420 | AR-15A2 Sporter II Carbine | 3rd Generation | Short Ribbed | S-1 | A1 | Yes | No & Yes | 5.56 NATO | 16 in. | A1 | 1:7 | Yes | A2 |
| R6430 | Sporter Lightweight | A2 | Short Ribbed | S-1 | A1 | No | Removable | 9mm NATO | 16 in. | A1 | 1:10 | Yes | A1 |
| R6450 | AR-15 9 mm Carbine | 3rd Generation | Short Ribbed | S-1 | A1 | No | No & Removable | 9mm NATO | 16 in. | A1 | 1:10 | Yes | A1 |
| R6500 | AR-15A2 Sporter II | A2 | Ribbed | S-1 | A1 | Yes | No & Yes | 5.56 NATO | 20 in. | A2 | 1:7 | Yes | A2 |
| R6510 | AR-15A2 Sporter II | A2 | Ribbed | S-1 | A2 | Yes | No | .222 REM | 20 in. | A2 | 1:14 | Yes | A2 |
| R6520 | AR-15A2 Government Carbine | 3rd Generation | Short Ribbed | S-1 | A2 | Yes | Yes | 5.56 NATO | 16 in. | A1 | 1:7 | Yes | A2 |
| R6521 | Colt Carbine | 3rd Generation | Short Ribbed | S-1 | A2 | Yes | Yes | 5.56 NATO | 16 in. | A1 | 1:7 | Yes/No | A2 |
| R6530 | Sporter Lightweight.223 | 3rd Generation | Short Ribbed | S-1 | A2 | Yes | Yes | 5.56 NATO | 16 in. | A1 | 1:7 | No | A2 |
| R6550 | AR-15A2 Government | A2 | Ribbed | S-1 | A2 | Yes | Yes | 5.56 NATO | 20 in. | A2 | 1:7 | Yes | A2 |
| R6550CC | AR-15A2 Government | A2 | Ribbed | S-1 | A2 | Yes | Yes | 5.56 NATO | 20 in. | A2 | 1:7 | Yes | A2 |
| R6550K | AR-15A2 Government | A2 | Ribbed | S-1 | A2 | Yes | Yes | 5.56 NATO | 20 in. | A2 | 1:7 | Yes | A2 |
| R6551 | Sporter Target | A2 | Ribbed | S-1 | A2 | Yes | Yes | 5.56 NATO | 20 in. | A2 | 1:7 | Yes | A2 |
| R6600 | AR-15A2 HBAR | A2 | Ribbed | S-1 | A2 | Yes | Yes | 5.56 NATO | 20 in. | HBAR | 1:7 | Yes | A2 |
| R6600DH | AR-15A2 Delta HBAR | A2 | Ribbed | S-1 | A2 | Yes | Yes | 5.56 NATO | 20 in. | HBAR | 1:7 | Yes | A2 |
| R6600K | AR-15A2 HBAR | A2 | Ribbed | S-1 | A2 | Yes | Yes | 5.56 NATO | 20 in. | HBAR | 1:7 | Yes | A2 |
| R6601 | Sporter Match HBAR | A2 | Ribbed | S-1 | A2 | Yes | Yes | 5.56 NATO | 20 in. | HBAR | 1:7 | No | A2 |
| R6601DH | Sporter Match Delta HBAR | A2 | Ribbed | S-1 | A2 | Yes | Yes | 5.56 NATO | 20 in. | HBAR | 1:7 | No | A2 |
| R6700 | Sporter Competition HBAR | A2 | Ribbed | S-1 | Flattop | Yes | Yes | .223 REM 5.56 NATO | 20 in. | HBAR | 1:9 | No | A2 |
| R6700CH | Sporter Competition HBAR | A2 | Ribbed | S-1 | Flattop | Yes | Yes | .223 REM 5.56 NATO | 20 in. | HBAR | 1:9 | No | A2 |
| R6700S | Sporter Competition HBAR | A2 | Ribbed | S-1 | Flattop | Yes | Yes | .223 REM 5.56 NATO | 20 in. | HBAR | 1:9 | No | A2 |
| R6701 | Sporter Competition HBAR | A2 | Ribbed | S-1 | Flattop | Yes | Yes | .223 REM 5.56 NATO | 20 in. | HBAR | 1:9 | No | A2 |
| R6721 | AR-15A3 Tactical Carbine | 4th Generation | Short Ribbed | S-1 | A2 | Yes | Yes | .223 REM 5.56 NATO | 16 in. | HBAR | 1:9 | Yes | A2 |
| R6724 | Sporter Competition HBAR | A2 | Ribbed | S-1 | Flattop | Yes | Yes | .223 REM 5.56 NATO | 24 in. | HBAR | 1:9 | No | A2 |
| R6731 | AR-15A3 Competition HBAR | A2 | Short Ribbed | S-1 | A2 | Yes | Yes | .223 REM 5.56 NATO | 16 in. | HBAR | 1:9 | No | A2 |
| R6750 | Sporter Competition HBAR | A2 | Ribbed | S-1 | A2 | Yes | Yes | 5.56 NATO | 20 in. | Super-Heavy | 1:7 | No | A2 |
| R6821 | Sporter Carbine | 3rd Generation | Short Ribbed | S-1 | A2 | Yes | Yes | 7.62×39mm | 16 in. | HBAR | 1:12 | No | A1 |
| R6830 | Sporter Lightweight | A2 | Short Ribbed | S-1 | A2 | Yes | Yes | 7.62×39mm | 16 in. | HBAR | 1:12 | No | A1 |
AR series models
| Colt model no. | Name | Stock | Hand guards | Fire control | Rear sight | Forward assist | Case deflector | Caliber | Barrel length | Barrel profile | Barrel twist | Bayonet Lug | Muzzle device |
| AR6320 | AR-15 Lightweight | 4th Generation | Short Ribbed | S-1 | A1 | Yes | Yes | .223 REM 5.56 NATO | 16 in. | A1 | 1:9 | Yes | A2 |
| AR6450 | AR-15 9 mm Carbine | 3rd Generation | Short Ribbed | S-1 | A1 | No | Removable | 9mm NATO | 16 in. | A1 | 1:10 | Yes | A1 |
| AR6520 | AR-15A2 Government Carbine | 4th Generation | Short Ribbed | S-1 | A2 | Yes | Yes | 5.56 NATO | 16 in. | A1 | 1:7 | Yes | A2 |
| AR6520SP | AR-15A2 Government Carbine | 4th Generation | Short Ribbed | S-1 | A2 | Yes | Yes | 5.56 NATO | 10 in. | A2 | 1:7 | Yes | A2 |
| AR6525 | AR-15A2 Government Carbine | 4th Generation | Short Ribbed | S-1 | A2 | Yes | Yes | .223 REM 5.56 NATO | 16 in. | A2 | 1:9 | Yes | A2 |
| AR6530 | AR-15 Lightweight | A2 | Short Ribbed | S-1 | A2 | Yes | Yes | .223 REM 5.56 NATO | 16 in. | A1 | 1:7 | Yes | A2 |
| AR6551 | AR-15 Target Model | A2 | Ribbed | S-1 | A2 | Yes | Yes | .223 REM 5.56 NATO | 20 in. | A2 | 1:7 | Yes | A2 |
| AR6601 | AR-15 Match HBAR | A2 | Ribbed | S-1 | A2 | Yes | Yes | .223 REM 5.56 NATO | 20 in. | HBAR | 1:7 | Yes | A2 |
| AR6700 | AR-15 Competition HBAR | A2 | Ribbed | S-1 | Flattop | Yes | Yes | .223 REM 5.56 NATO | 20 in. | HBAR | 1:9 | Yes | A2 |
| AR15A4 | AR-15A4 Rifle | A2 | Ribbed | S-1 | Flattop | Yes | Yes | .223 REM 5.56 NATO | 20 in. | A2 | 1:7 | Yes | A2 |
| AR6720 | AR-15A4 Lightweight LE Carbine | 4th Generation | Short Ribbed | S-1 | Flattop | Yes | Yes | .223 REM 5.56 NATO | 16 in. | A1 | 1:7 | Yes | A2 |
| AR6721 | AR-15A3 Tactical Carbine | 4th Generation | Short Ribbed | S-1 | Flattop | Yes | Yes | .223 REM 5.56 NATO | 16 in. | HBAR | 1:9 | Yes | A2 |
| AR6721SP | AR-15A3 Tactical Carbine | 4th Generation | Short Ribbed | S-1 | Flattop | Yes | Yes | .223 REM 5.56 NATO | 10 in. | HBAR | 1:9 | Yes | A2 |
| AR6951 | Colt 9 mm Carbine | 4th Generation | Short Ribbed | S-1 | Flattop | No | Yes | 9mm NATO | 16.1 in. | A2 | 1:10 | Yes | A1 Birdcage |
MT and CR series models
| Colt model no. | Name | Stock | Hand guards | Fire control | Rear sight | Forward assist | Case deflector | Caliber | Barrel length | Barrel profile | Barrel twist | Bayonet Lug | Muzzle device |
| CR6724 | Colt Accurized Rifle | A2 | FF Tube | S-1 | Flattop | Yes | Yes | .223 REM 5.56 NATO | 24 in. | Stainless HBAR | 1:9 | No | - |
| CR6720 | Colt Accurized Rifle | A2 | FF Tube | S-1 | Flattop | Yes | Yes | .223 REM 5.56 NATO | 20 in. | Stainless HBAR | 1:9 | No | - |
| CRM16A1 | M16A1 Retro Reissue | A1 | Triangular | S-1 | A1 | Yes | No | 5.56 NATO | 20 in. | A1 | 1:12 | Yes | Type 2 Duckbill |
| MT6400 | Match Target M4 | 4th Generation | M4 | S-1 | Flattop | Yes | Yes | 5.56 NATO | 16 in. | M4 | 1:7 | No | - |
| MT6400C | Match Target M4 | 4th Generation | M4 | S-1 | Flattop | Yes | Yes | 5.56 NATO | 16 in. | M4 | 1:7 | No | Factory compensator |
| MT6430 | Match Target Lightweight | A2 | Short Ribbed | S-1 | A1 | No | Yes | 9mm Luger | 16 in. | A1 | 1:10 | No | - |
| MT6530 | Match Target Lightweight | A2 | Short Ribbed | S-1 | A2 | Yes | Yes | 5.56 NATO | 16 in. | A1 | 1:7 | No | - |
| MT6551 | Match Target Rifle | A2 | Ribbed | S-1 | A2 | Yes | Yes | 5.56 NATO | 20 in. | A2 | 1:7 | No | - |
| MT6601 | Match Target HBAR | A2 | Ribbed | S-1 | A2 | Yes | Yes | 5.56 NATO | 20 in. | HBAR | 1:7 | No | - |
| MT6601C | Match Target HBAR | A2 | Ribbed | S-1 | A2 | Yes | Yes | 5.56 NATO | 20 in. | HBAR | 1:7 | No | Factory compensator |
| MT6700 | Match Target Competition HBAR | A2 | Ribbed | S-1 | Flattop | Yes | Yes | .223 REM 5.56 NATO | 20 in. | HBAR | 1:9 | No | - |
| MT6700C | Match Target Competition HBAR | A2 | Ribbed | S-1 | Flattop | Yes | No | .223 REM 5.56 NATO | 20 in. | HBAR | 1:9 | No | Factory compensator |
| MT6731 | Match Target Competition HBAR II | A2 | Short Ribbed | S-1 | Flattop | Yes | Yes | .223 REM 5.56 NATO | 16 in. | HBAR | 1:9 | No | - |
| MT6830 | AR-15A2 Government Carbine | 3rd Generation | Short Ribbed | S-1 | A2 | Yes | Yes | .223 REM | 16 in. | HBAR | 1:12 | Yes | A2 |
LE series models
| Colt model no. | Name | Stock | Hand guards | Fire control | Rear sight | Forward assist | Case deflector | Caliber | Barrel length | Barrel profile | Barrel twist | Bayonet Lug | Muzzle device |
| LE1020 | Gas Piston Carbine | 4th Generation | Rail System | S-1 | Flattop | Yes | Yes | 5.56 NATO | 16 in. | M4 | 1:7 | Yes | A2 |
| LE1033 | Gas Piston Commando | 4th Generation | Rail System | S-1 | Flattop | Yes | Yes | 5.56 NATO | 11.5 in. | A2 | 1:7 | Yes | A2 |
| LE6920 | Law Enforcement Carbine | 4th Generation | M4 | S-1 | Flattop | Yes | Yes | 5.56 NATO | 16 in. | M4 | 1:7 | Yes | A2 |
| LE6920HB | Law Enforcement Carbine | 4th Generation | M4 | S-1 | Flattop | Yes | Yes | 5.56 NATO | 16 in. | M4 HBAR | 1:7 | Yes | A2 |
| LE6921 | M4LE Carbine | 4th Generation | M4 | S-1 | Flattop | Yes | Yes | 5.56 NATO | 14.5 in. | M4 | 1:7 | Yes | A2 |
| LE6921CQB | M4LE Carbine | 4th Generation | M4 | S-1 | Flattop | Yes | Yes | 5.56 NATO | 10.5 in. | M4 HBAR | 1:7 | Yes | A2 |
| LE6921HB | M4LE Carbine | 4th Generation | M4 | S-1 | Flattop | Yes | Yes | 5.56 NATO | 14.5 in. | M4 HBAR | 1:7 | Yes | A2 |
| LE6921SP | M4LE Carbine | 4th Generation | M4 | S-1 | Flattop | Yes | Yes | 5.56 NATO | 10 in. | M4 HBAR | 1:7 | Yes | A2 |
| LE6933 | M4LE Commando | 4th Generation | Short Ribbed | S-1 | Flattop | Yes | Yes | 5.56 NATO | 11.5 in. | A2 | 1:7 | Yes | A2 |
| LE6940 | Monolithic Advanced Law Enforcement Carbine | 4th Generation | Monolithic Rail System | S-1 | Flattop | Yes | Yes | 5.56 NATO | 16 in. | M4 | 1:7 | Yes | A2 |
| LE6941 | Law Enforcement Carbine | 4th Generation | Rail System | S-1 | Flattop | Yes | Yes | 5.56 NATO | 16 in. | M4 | 1:7 | Yes | A2 |
LT series models
| Colt model no. | Name | Stock | Hand guards | Fire control | Rear sight | Forward assist | Case deflector | Caliber | Barrel length | Barrel profile | Barrel twist | Bayonet Lug | Muzzle device |
| LT6720-R | Talo Special Edition | 4th Generation | Rail System | S-1 | Flattop | Yes | Yes | 5.56 NATO | 16 in. | Lightweight pencil barrel | 1:7 | No | A2 |
Glossary of terms
Stock
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
- 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" 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
- 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.
- Monolithic Rail Platform : A variant Rail System made by LMT. It has a free-floating barrel for greater accuracy.
Fire control
- S-1: The selector is Safe – Semi-Automatic
- S-F: The selector is Safe – Fully Automatic
- S-1-F: The selector is Safe – Semi-Automatic – Fully Automatic
- S-1–3: The selector is Safe – Semi-Automatic – 3-Round Limiter
- S-F-1–3: The selector is Safe – Fully Automatic – Semi-Automatic – 3-Round Limiter. First Generation 4 position group
- S-1–3-F: The selector is Safe – Semi-Automatic – 3-Round Limiter – Fully Automatic. 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 or A2 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 or A2 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 .222 Remington or.223 Remington
- 1:12: 1 right hand twist every 12 inches .223 Remington or 7.62×39mm
- 1:10: 1 right hand twist every 10 inches 9×19mm NATO
- 1:9: 1 right hand twist every 9 inches .223 Remington & 5.56×45mm NATO
- 1:7: 1 right hand twist every 7 inches 5.56×45mm NATO
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 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