Ruger Mark IV, 22/45 Lite, Single Action, Semi-automatic, Polymer Frame Pistol, 22LR, 4.4 Barrel, Anodized Finish, Black, Oversized G10 Grips, Adjustable Rear Sight, Ambidextrous Safety, 10 Rounds, 2 Magazines 43959 This latest addition to the Ruger Mark IV 22/45 Lite family features oversized gray and black G10 grip panels and non-threaded, cold hammer-forged barrel. Like other Mark IV 22/45 Lite models, it features the simple, one button takedown for quick and easy cleaning, a lightweight, ventilated, aerospace-grade aluminum receiver with a 4.4" tensioned stainless steel barrel, and an accurate sighting system featuring an adjustable rear sight and a factory-installed Picatinny rail for easy mounting of optics.