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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 950 | LMG (Colt/ Diemaco project) | A2 | S-F | Flattop | Yes | Yes | 20 in. | HBAR | 1:7 | Square LMG | Yes | A2 |
| 977 | M4 Carbine | 4th Generation | S-1-3 | Flattop | Yes | Yes | 14.5 in. | M4 | 1:7 | M4 | 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 | M4A1 Carbine | 4th Generation | S-1-F | Flattop | Yes | Yes | 14.5 in. | M4 | 1:7 | M4 | Yes | A2 |