The Diamondback DB10 is an AR-10-pattern semi-automatic rifle chambered in .308 Winchester. Built on the same mil-spec philosophy as the DB15 but scaled to the larger .308 platform for longer-range capability. Type: Semi-Auto Rifle Action: Semi-Automatic Caliber: .308 Winchester Capacity: 20 Year introduced: 2014, USA Weight: 8.6 oz Overall length: 38.5" Status: Active Intended use: Hunting, Competition, Long Range