Get the Brownells' exclusive Complete AR Upper Receiver with a Keymod Handguard while you still can! Once they are gone, they are gone! Don't worry though, Brownells has you covered with the Complete AR Upper Receiver Gen II with an M-LOK Handguard!

This Brownells’ exclusive Complete AR Upper Receiver is chambered in 5.56x45mm NATO and made in the USA. 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

Weight: 4.85lbs

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.



Big Book Catalog, Issue:70, Page:002