Ruger has long set the standard for reliable, affordable and accurate .22 LR handguns, beginning with the introduction of the Standard Pistol in 1949. Since then, the Standard Pistol has undergone a series of enhancements with the development of the Mark I, Mark II, Mark III and now the Mark IV Pistol. The Mark IV maintains the classic look of the original but adds a simple, one-button takedown for quick and easy field stripping.