Ruger Mark IV 22/45 Lite, Semi-Automatic Pistol, Polymer Frame, Single Action Only, 22 LR, 4.4 Threaded Barrel, 1/2x28, Anodized Finish, Black Frame, Kryptek Typhon Frame, Optic Ready, Ambidextrous Safety, 10 Rounds, 2 Magazines 43958 The Ruger Mark IV 22/45 Lite Rimfire Pistol features a simple, one-button takedown for quick and easy field-stripping and proper chamber-to-muzzle cleaning. Pressing a button in the back of the frame allows the barrel-receiver assembly to tilt up and off the grip frame without the use of tools. Cold hammer-forged barrel results in ultra-precise rifling that provides exceptional accuracy and longevity.