This firearm is classified as a Pistol and not a Short Barreled Rifle (NFA regulated items require ATF approval and a tax stamp). The MK18 Pistol features the picatinny quad rail Daniel Defense currently provides to USSOCOM and a 10.30" Cold Hammer Forged Barrel. The MK18 RISII features the patented 6-bolt Bolt-Up System and has been rigorously tested prior to fielding by USSOCOM; SB Tactical SBA3 Pistol Stabilizing Brace with 5 positions of adjustability and integral; ambidextrous QD swivel attachment point; ambi GRIP-N-RIP Charging Handle accommodates left- and right-handed shooters. This pistol comes equipped with the ergonomic Daniel Defense Pistol Grip with an integral trigger guard and soft touch overmolding. Includes case.