AR-15 variants Numbered Colt military models Numbered Colt military 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 614 | M16 | 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 | Round | 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 |