Ruger Mark IV 22/45 22 Long Rifle 5.5in Blued Pistol - 10+1 Rounds - Internal cylindrical bolt construction ensures permanent sight to barrel alignment and higher accuracy potential than conventional moving slide designs. Simple, one-button takedown for quick and easy field-stripping and proper chamber to muzzle cleaning Features a conveniently located push-button magazine release on the left side of the frame Magazine drops free on release for faster reloading Magazine disconnect prevents discharge when the magazine has been removed