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. Free-Floated Cold Hammer Forged Barrel for long term durability and superior accuracyFull Length Top Rail for mounting optics of almost all sizesAmbidextrous Safety Selector Switch for left and right handed shooters Daniel Defense MK18 5.56 NATO 10.3" 1:7 Mil Spec Brown Rifle 02-088-15028-011