The CMMG Mk4 in .300 Blackout is a suppressor-optimized AR-15 carbine with a 16-inch barrel and CMMG's standard mil-spec construction, offering reliable .300 Blackout performance at a mid-tier price. Type: Rifle Action: Semi-Automatic Caliber: .300 Blackout Capacity: 30 Year introduced: 2012, USA Weight: 62 oz Overall length: 32.5" Status: Active Intended use: Tactical, Hunting, Home Defense