M4 Carbine Short Barrel Rifle Lower Receiver Assembly

M4 Carbine Short Barrel Rifle Lower Receiver Assembly

Factory Colt complete lower receiver assembly, registered by Colt as a Short Barrel Rifle to build your AR15 or M4. Compatible with all mil-spec AR15/M4/M16 upper receivers and roll marked "M4 Carbine". Manufactured to truly meet and exceed all Mil Spec standards. 

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