Ruger Mark IV 22/45 .22 LR 10+1 4.40" Stainless Threaded Bull Barrel, Black Picatinny Rail Receiver, Black Polymer Frame, Black Checkered Polymer Grip The Ruger Mark IV 22/45 features a one-button takedown; precision-molded polymer grip frame with a serrated front strap and checkered backstrap; threaded barrel with thread protector; checkered, 1911-style grip panels; contoured ejection port and easy-to-grasp bolt ears; Picatinny rail; ambidextrous manual safety can be converted to left-side only with included washer; push-button magazine release on the left side of the frame; magazine drops free on release for convenient reloading and magazine disconnect prevents discharge when the magazine has been removed. Includes two 10rd magazines and thread protector. Guns.com First Look at the Ruger Mark IV 22/45 .22 LR .