Ruger's original Mark I Target pistol, William Ruger's first commercially successful product. The Mark I established Ruger as a firearms manufacturer and launched the company that became one of America's largest. Features a 5.5-inch bull barrel. Type: Pistol Action: Semi-Automatic Caliber: .22 LR Capacity: 9 Year introduced: 1952, USA Weight: 42 oz Overall length: 9.32" Status: Discontinued Intended use: Bullseye Competition, Plinking, Collecting