Ruger Mark IV, 22/45 Lite, Single Action, Semi-automatic, Polymer Frame Pistol, 22LR, 4.4 Threaded Barrel, Gold Finished Barrel and Trigger, Black Frame, Checkered Grips, Adjustable Rear Sight, Ambidextrous Safety, 10 Rounds, 2 Magazines 43927 The Ruger Mark IV 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.