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