AAP01 Black Mamba CNC Upper Receiver Kit B hk416n to prevent the inner barrel

to prevent the inner barrel from protruding beyond the outer barrel

and pistol hop-up chambers

delivering the ultimate build: HAO's HRGI construction

This version includes a rail for mounting an optic

1x CNC red aluminum Prowler hop plate

AAP01 Black Mamba CNC Upper Receiver Kit B hk416n to prevent the inner barrelAAP01 Black Mamba CNC Upper Receiver Kit B Made of solid CNC aluminum with a full length Picatinny rail on top and a 5 point rail under the front section. The Black Mamba upper also includes upgraded iron sights, adjustable at the rear, and a compensator. Converts the pistol into a recoil operated assault rifle, giving it an extremely stylish and modern finish.