Aero Precision M5E1 in .338 Federal with 16-inch barrel. AR-10-pattern platform. One of the only production semi-auto .338 Federal carbines. Exceptional close-range terminal performance. Type: Rifle Action: Semi-Auto Caliber: .338 Federal Capacity: 10 Year introduced: 2019, USA Weight: 120 oz Overall length: 34.5" Status: Active Intended use: Hunting, Defense, Special Purpose