The CMMG Mk4 is the premium tier of CMMG's AR-15 lineup, featuring enhanced components and tighter tolerances than the Resolute series. The 16-inch mid-length chrome-lined barrel, Geissele SSA-E trigger, BCM Gunfighter furniture, and CMMG's RML15 M-LOK handguard make the Mk4 a competition-ready rifle out of the box. CMMG's in-house barrel manufacturing provides consistent accuracy across units. Type: Rifle Action: Semi-Automatic Caliber: 5.56x45mm NATO Capacity: 30 Year introduced: 2014, USA Weight: 68 oz Overall length: 32.5" Status: Active Intended use: Competition, Patrol Rifle, Home Defense