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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 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 |