The Ruger 43955 Mark IV 22/45 Lite brings the Mark IV series legendary reliability to a lightweight, range-ready package that shooters will appreciate for training, plinking, and small-game work; chambered in .22 LR with a 10+1 capacity and a 4.40" cold hammer-forged stainless threaded barrel (1/2"-28) this pistol delivers consistent accuracy and long barrel life while the threaded muzzle and included thread protector make attaching muzzle accessories or a suppressor straightforward for noise-sensitive range sessions. The Lite blends a ventilated aerospace-grade aluminum receiver finished in champagne anodize with a black anodized polymer grip frame and checkered 1911-style panels for a comfortable, non-slip hold and balanced 25 oz. feel, while the internal cylindrical bolt design and contoured ejection port preserve sight-to-barrel alignment for higher accuracy potential than moving-slide designs. You get convenient one-button takedown for tool-free field-stripping, an adjustable rear sight over a factory-installed Picatinny rail for optics, serrated slide ears for positive cycling, an ergonomic bolt stop, ambidextrous manual safety (convertible to left-side only), push-button magazine release and magazine disconnect for added safety; this semi-auto pistol is an FFL-required firearm ideal for shooters seeking a lightweight, accurate .22 trainer or suppression-ready rimfire.