I have this MK18 AR15 style Pistol by the original MK18, which has been very popular within the Law Enforcement and Special Operations communities. This firearm is actually classified as a Pistol and not a Short-Barreled Rifle. it features the picatinny quad rail Daniel Defense currently provides to USSOCOM and a 10.3 inch Cold Hammer Forged Barrel, the same length commonly used for CQB operations. The MK18 RISII features this patented 6-bolt Bolt-Up System and has been meticulously tested. This pistol comes equipped with an integral trigger guard and soft touch overmolding. The independently ambi GRIP-N-RIP Charging Handle accommodates left- and right-handed shooters, so its the perfect firearm for anyone.