The M&P10 is Smith & Wesson's AR-10-pattern rifle chambered in .308 Winchester. The 18-inch medium-contour barrel splits the difference between a 16-inch carbine and a 20-inch full-length rifle, optimizing for hunting and mid-range precision. Type: Semi-Auto Rifle Action: Gas-Operated Caliber: .308 Win Capacity: 20 Year introduced: 2012, USA Weight: 7.7 oz Overall length: 38" Status: Active Intended use: Hunting, Long Range, Range