CMMG Mk3 in .308 Win. AR-10 pattern rifle with 16.1-inch barrel, direct impingement, CMMG proprietary lower pattern. Type: Rifle Action: Semi-automatic Caliber: .308 Winchester Capacity: 20 Year introduced: 2012, USA Weight: 96 oz Overall length: 36" Status: Active Intended use: Hunting/Battle Rifle