- Material : Aluminum 7075 T6 - Rail : 416 SMR OEM by Zparts Taiwan - (Rail section long x1, short x2 included) - Upper and lower receiver with FDE Cerkote by FCC Custom - Buffer tube, nut, end plate built-in - Aluminum Outer barrel x 1 - Gas block & dummy gas piston unit x 1 - HK type Aluminum high speed bolt carrier x 1 - HK type Ambicharging handle x 1 - HK type ambi selector x 1 - SF type Steel flash hider x 1 - Steel barrel extension x 1
