Daniel Defense DDM4 MK18 with Brace 5.56mm NATO 10.3in Black/FDE Semi Automatic Modern Sporting Pistol - No Magazine - 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. Threaded Barrel: 1/2 x 28 Muzzle Device: Improved design reduces flash signature compared to the traditional A2 birdcage for AR15 style firearms Cold Hammer Forged: Intense hydraulic pressure process that forms the most accurate and longest-lasting barrels attainable Flared Magazine Well: Widened and beveled magwell funnels magazines into place for the fastest, most secure reloads possible Ambidextrous for right or left-handed shooters Includes Case Free Float Rail System: Proprietary 4- or 6-bolt attachment to the upper receiver allows the rail system to free float the barrel, which will ensure barrel harmonics are not affected during operation SBA3 Pistol Stabilizing Brace: ATF-compliant, 5 positions of adjustability and adjustable nylon strap QD Points: Integrated quick-disconnect points for the attachment of slings Picatinny: Mil-Spec 1913 Picatinny Rail attachment Ergonomic Daniel Defense Pistol Grip: Ergonomic wrist angle, integral trigger guard and nonslip grip for comfort and control in all conditions