The Browning BAR MK 3 OSS is a usa-made semi-automatic rifle chambered in 308 Win, introduced in 1993. Primary use: Hunting, Big Game. Type: Rifle Action: Semi-Automatic Caliber: 308 Win Capacity: 20 Year introduced: 1993, USA Weight: 124 oz Overall length: 44.25" Status: Active Intended use: Hunting, Big Game