How a Ruger Mark II Pistol Works

Wikipedia: The Ruger Standard Model is a rimfire semi-automatic pistol introduced in 1949 as the first product manufactured by Sturm, Ruger & Co., and was the founding member of a product line of .22 Long Rifle cartridge handguns, including its later iterations: the MK II, MK III, and MK IV. It is marketed as an inexpensive .22 caliber rimfire intended for casual sport and target shooting, and plinking. Designed by company founder William B. Ruger, the Standard model and its offspring went on to become the most accepted and successful .22 caliber semi-automatic pistols ever produced. Type Semi-automatic pistol Place of origin United States Production history Designer William Ruger Designed 1949 Manufacturer Sturm, Ruger Produced 1949–present Variants MK I Target MK II MK II Target MK II Government Target Competition model MK III MK III Target 22/45 MK IV Specifications Barrel length 4 in (10 cm) 4.75 in (12.1 cm) 5.25 in (13.3 cm) 5.5 in (14 cm) 6 in (15 cm) 6.875 in (17.46 cm) 10 in (25 cm) Cartridge .22 Long Rifle Action blowback Feed system 9- or 10-round box magazine Sights Open iron sights, both fixed and adjustable