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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| R6450 | AR-15 9mm Carbine | 3rd Generation | S-1 | A1 | No | No & Removable | 16 in. | A1 | 1:10 | Short Ribbed | Yes | A1 |
| R6500 | AR-15A2 Sporter II | A2 | S-1 | A1 | Yes | No & Yes | 20 in. | A2 | 1:7 | Ribbed | Yes | A2 |
| R6520 | AR-15A2 Government Carbine | 3rd Generation | S-1 | A2 | Yes | Yes | 16 in. | A1 | 1:7 | Short Ribbed | Yes | A2 |
| R6530 | Sporter Lightweight .223 | 3rd Generation | S-1 | A2 | Yes | Yes | 16 in. | A1 | 1:7 | Short Ribbed | No | A2 |
| R6550 | AR-15A2 Government | A2 | S-1 | A2 | Yes | Yes | 20 in. | A2 | 1:7 | Ribbed | Yes | A2 |
| R6550CC | AR-15A2 Government (w/ factory camouflage finish) | A2 | S-1 | A2 | Yes | Yes | 20 in. | A2 | 1:7 | Ribbed | Yes | A2 |