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AR-15 Complete Upper Receiver Black Keymod 5.56
Cartridge: 5.56 mm NATO
Includes a low profile gas block, bolt carrier group, charging handle, forward assist, ejection port cover and phosphate finish help to complete this outstanding package.
The 16” standard M4 carbine length barrel features a standard M4 contour with a 1:8 twist. A standard A3 13-slot aluminum flat top receiver comes with a 10” free-float handguard utilizing the KeyMod rail system.
7075 aluminum Mil-Spec upper receiver
M4 feed ramps
416R steel barrel with black nitride finish inside and out
Standard A2 birdcage style threaded flash hider
This complete A3 upper receiver will attach to almost any standard AR-15 lower receiver.
The BCG is the M16-style BCG. It will not work with older Colt lowers that have the sear block.