AR-15 Variants - Colt Military Models Without Model Numbers

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

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