Perfect for a pistol build, this complete upper assembly from Advanced Armament Corporation is ready to drop onto any AR-15/M16/M4 lower with mil-spec push pin locations. It features a 12.5" nitrided barrel with 1:7 twist, and a Knights Armament URX rail. It is designed for use with a carbine receiver extension, standard GI buffer spring, and H2 buffer.

NOTE: All NFA rules apply if using this upper to build a rifle/carbine.

Specifications and Features:
.300 AAC Blackout caliber
CNC machined aircraft aluminum receiver
12.5" barrel, black nitride finish
1:7 twist rate
5/8-24 barrel threads
Full auto profile bolt carrier group
AAC 51T Blackout flash hider
Knights Armament URX rail
Black