The Ruger 10/22 Carbine with classic walnut stock and 18.5-inch barrel. The most popular rimfire semi-auto rifle in American history with over 7 million produced. Type: Semi-Auto Rifle Action: Blowback Caliber: .22 LR Capacity: 10 Year introduced: 1964, USA Weight: 5 oz Overall length: 37" Status: Active Intended use: Plinking, Training, Small Game