Colt M4A1 Carbine Completed Lower Receiver Assembly (5.56mm Marked)
This Colt M4A1 Carbine completed lower receiver comes assembled with the fire control components and controls installed, and features the classic "PROPERTY OF U.S. GOVT. M4A1 CARBINE" markings with "CAL. 5.56 MM."
Includes an M4-style receiver extension/buffer tube installed on the lower; collapsible buttstock included (not installed), plus a separate sling loop/end plate.




