PTR 9KT BR 9mm Luger 30+1 5.16" Black Nitride 3-Lug Threaded Barrel, M-LOK Handguard, Black Nitride Aluminum Picatinny Rail Receiver, Brace, Black Polymer Grip The 9KT 9mm Pistol semi-automatic operation, powered by a roller-delayed blowback system, is primed for an optional NFA-registered auto sear pack, elevating its functionality. featuring a 5.16" nitride heat-treated barrel, designed with a 3-lug and threaded 1/2" x 28 pattern, optimized for suppressor attachment. Includes two magazines, rear sights adjustment tool, cable lock, single-point bungee sling and case.