M&P10 variant chambered in .338 Federal, a cartridge derived from the .308 case necked up to .338 caliber. The 18-inch barrel delivers substantially greater energy than .308 Win on large game while retaining M&P10 magazine compatibility with modified followers. Type: Semi-Auto Rifle Action: Gas-Operated Caliber: .338 Federal Capacity: 10 Year introduced: 2017, USA Weight: 8 oz Overall length: 38" Status: Active Intended use: Hunting, Long Range