Long-barrel variant of the M&P10 with a 20-inch medium-heavy contour barrel optimized for full powder burn of .308 Winchester. Intended for hunters and precision shooters who want maximum velocity from a semi-automatic platform. Type: Semi-Auto Rifle Action: Gas-Operated Caliber: .308 Win Capacity: 20 Year introduced: 2014, USA Weight: 8.2 oz Overall length: 40" Status: Active Intended use: Hunting, Long Range, Range