Full-size AR-10-pattern semi-automatic rifle in .308 Win / 7.62x51 NATO. 18-inch stainless steel barrel with a 1:10 twist, free-float aluminum handguard, adjustable stock, and Magpul trigger guard. The M&P 10 is S&W's primary entry into the long-range semi-automatic market. Type: Rifle Action: Semi-Automatic Caliber: 308 Win Capacity: 20 Year introduced: 2012, USA Weight: 7.71 oz Overall length: 38.25" Status: Active Intended use: Hunting, Competitive Shooting, Home Defense