The Ruger Mark IV 22/45 Lite .22 LR Pistol is single action and has a 10+1-round capacity. It's built with a cold hammer-forged tensioned stainless steel barrel, ventilated aerospace-grade aluminum receiver and a G10 polymer grip. Fixed front and adjustable rear sights, Picatinny rail and an ambidextrous manual safety complete the design. Ruger Mark IV 22/45 Lite .22 LR Pistol - Handgun Semiauto Rmfire at Academy Sports