Colt Military Models Without Model Numbers
In rare instances some Colt models have been produced without in house model numbers, or at least one which is readily apparent.
| Name | Stock | Fire control | Rear sight | Forward assist | Case deflector | Barrel length | Barrel profile | Barrel twist | Hand guards | Bayonet Lug | Muzzle device |
|---|---|---|---|---|---|---|---|---|---|---|---|
| M16 PIP/M16A1E1 | A2 | S-1-F or S-1-3 | A2 | Yes | Yes | 20 in. | A2 | 1:7 | Ribbed | Yes | A1 or A2 |
| M16 ACR/M16A2E2 | Retracable ACR | S-1-3 | Flattop | Yes | Yes | 20 in. | A2 | 1:7 | ACR Type | No | ACR compensator |
| XM231 | FPW Wire | S-F | None | No | No | 15.6 in. | A1 | 1:12 | Short Round | No | A1 |
| M231 | None | S-F | None | No | No | 15.6 in. | A1 | 1:12 | Short Round | No | A1 |
Read more about this topic: AR-15 Variants
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