AR-15 variants R series models R series 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| R6551 | Sporter Target | A2 | S-1 | A2 | Yes | Yes | 20 in. | A2 | 1:7 | Ribbed | No | A2 |
| R6600 | AR-15A2 HBAR | A2 | S-1 | A2 | Yes | Yes | 20 in. | HBAR | 1:7 | Ribbed | Yes | A2 |
| R6601 | Sporter Match HBAR | A2 | S-1 | A2 | Yes | Yes | 20 in. | HBAR | 1:7 | Ribbed | No | A2 |
| R6700 | Sporter Competition HBAR | A2 | S-1 | Flattop | Yes | Yes | 20 in. | HBAR | 1:9 | Ribbed | No | A2 |
| R6721 | AR-15A3 Tactical Carbine | 4th Generation | S-1 | A2 | Yes | Yes | 16 in. | HBAR | 1:9 | Short Ribbed | Yes | A2 |
| R6724 | Sporter Competition HBAR | A2 | S-1 | Flattop | Yes | Yes | 24 in. | HBAR | 1:9 | Ribbed | No | A2 |
| R6731 | AR-15A3 Competition HBAR | A2 | S-1 | A2 | Yes | Yes | 16 in. | HBAR | 1:9 | Short Ribbed | No | A2 |