ArmaLite AR-10 Competition rifle in .308 Win with 18-inch stainless steel barrel and two-stage trigger, optimized for DCM and precision semi-auto competition. Type: Rifle Action: Semi-Auto Caliber: 308 Win Capacity: 20 Year introduced: 2008, USA Weight: 120 oz Overall length: 38.5" Status: Active Intended use: DCM competition, precision semi-auto