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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| R6750 | Sporter Competition HBAR (bundled w/ bipod) | A2 | S-1 | A2 | Yes | Yes | 20 in. | Super-Heavy | 1:7 | Ribbed | No | A2 |
| R6821 | Sporter Carbine (7.62x39mm) | 3rd Generation | S-1 | A2 | Yes | Yes | 16 in. | HBAR | 1:12 | Short Ribbed | No | A1 |