Available in both pistol and SBR models, the Daniel Defense MK18 is a weapon designed with maneuverability and modularity in mind. What sets the MK18 apart from Daniel Defense's other MSR platforms is the RIS II Bolt-Up Rail System, the same tested by and issued to members of USSOCOM. The MK18 is built on a carbine length direct impingement gas system and features 10.5" free floated barrel. SBR models include Daniel Defense's proprietary 6-position buttstock with over molding at contact points. Pistol models come with a SB-Tactical pistol stabilizing brace, and both configurations come with the over molded pistol grip.