The Ruger MK II is a rimfire semi-automatic pistol chambered in .22 Long Rifle and manufactured Sturm, Ruger & Company. Ruger rimfire pistols are some of the most popular handguns made, with over three million sold. The MK II ("Mark Two") was made from 1982 to 2005. Previous models include the Standard, Ruger''s first model, made from 1949 to 1982, and the MK I Target, made from 1951 to 1982. MK II variations include the Target models, which have heavier barrels and adjustable sights, and the 22/45 models, which have a polymer frame with a grip-angle that matches the Colt 1911 rather than the steel frame''s Luger P08-like layout. The MK II was removed from production in 2004, when it was replaced by the MK III. All Ruger rimfire pistols are chambered in .22 Long Rifle only.