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 10.3" free floated barrel. Pistol model come with a SB-Tactical pistol stabilizing brace, and both configurations come with the over molded pistol grip.