The complete 5.56NATO upper receiver assembly from Advanced Armament features a 16" Nitrided 1:7 Twist Barrel that is threaded 5/8-24. It has a AAC 51T BLACKOUT Flash Hider and "Full Auto" BCG. It has a Mid-Length Gas System and KAC URX Rail. IT is ready to drop onto your AR15/M16/M4 lower. It works with an AR lower with "Mil-Spec" push pin locations.
|Type||Complete Gas Impingement|
|Caliber||223 Remington/5.56 NATO|
|Product Model||5.56 NATO|