The Winchester Model 100 in .308 Winchester with 22-inch barrel is a rotary-bolt gas-operated semi-auto hunting rifle that competed directly with the Remington 742 during the 1960s. It featured a distinctive one-piece stock and a gas-operated system designed for smooth cycling. Later recalled for safety reasons related to the firing pin. Type: Semi-Auto Rifle Action: Gas-Operated Caliber: .308 Win Capacity: 4 Year introduced: 1961, USA Weight: 7.25 oz Overall length: 42.5" Status: Discontinued Intended use: Hunting