Colt M4 Upper Receiver 5.56 16"

[Atlantic Firearms.com]

If you're looking to build a new AR15, check out the Colt M4 Upper Receiver chambered for 5.56 ammo. This upper comes featuring a 16" barrel. It features a threaded muzzle, A2 flashhider, flip up rear sights, & a polymer handguard. If you're in the market to build your rifle or just replace an aging upper, Colt's model is the best you can get. $745.00

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