CMMG's Mk47 Mutant uses a modified AR-15 lower combined with a purpose-built upper to accept standard AK-pattern magazines in the 7.62x39mm cartridge. The result is an AR-ergonomics rifle with AK-caliber performance and magazine compatibility. Type: Rifle Action: Semi-Automatic Caliber: 7.62x39mm Capacity: 30 Year introduced: 2015, USA Weight: 112 oz Overall length: 33.5" Status: Active Intended use: Home Defense, Hunting, Competition