This is a pistol only, single action version of the Navy SEALS Mk 18 Mod 0 firearm. The LMT upper is 10.5” with a 1 in 7 twist. It has a Knight’s chipped flash hider, a Knight’s RAS forend, and a Surefire M96.9V light with the ARMS lever. The rear sight is a LMT iron sight that can co-witness with the AIMPOINT Comp M2 mounted on the reciever’s rail with a PRI mount. The lower is a pistol only Rock River Arms receiver. Chambered in 5.56mm. Like new and never fired. It transfers as a pistol not a rifle. My FFL to your FFL only.