The Barrett REC7 is a piston-driven semi-automatic rifle based on the AR-10 platform. The .308 Win 16-inch configuration is a compact gas-piston battle rifle designed for military and law enforcement use. Type: Semi-Automatic Rifle Action: Semi-Automatic Caliber: .308 Winchester Capacity: 20 Year introduced: 2007, USA Weight: 144 oz Overall length: 35.5" Status: Active Intended use: Tactical, Law Enforcement, Military