Winchester's first semi-automatic rifle, designed by T.C. Johnson and chambered in the proprietary .22 Winchester Automatic cartridge. The first successful semi-automatic .22 rifle in America, predating all major competition by years. Type: Rifle Action: Semi-Automatic Caliber: .22 Win Auto Capacity: 10 Year introduced: 1903, USA Weight: 5.75 oz Overall length: 39" Status: Discontinued Intended use: Plinking, Collecting