The Ruger Mark IV Hunter (model 40118) is a 22 LR single-action semi-auto pistol built for field use, range training, and precision rimfire work, featuring a 6.88" fluted bull barrel in satin stainless for improved heat dissipation and steady follow-through, a CNC-machined one-piece stainless grip frame and checkered laminate panels that provide a natural pointing angle and a secure hold, and an internal cylindrical bolt design that maintains permanent sight-to-barrel alignment for greater potential accuracy than moving-slide designs. The Mark IV series' simple one-button takedown and recessed frame release let you field-strip without tools for thorough chamber-to-muzzle cleaning, while contoured bolt ears and an ergonomic bolt stop make operation smooth and reliable round after round. The drilled-and-tapped receiver accepts Weaver- or Picatinny-style optics, complemented by a fiber optic front and adjustable rear sight for fast target acquisition and precise zeroing. Ambidextrous manual safety that can be converted to left-side only, push-button magazine release, magazine disconnect, 10+1 capacity, 1:16" twist, 6-groove rifling, 44 oz weight and 11.12" overall length round out a handgun that balances durability, accuracy, and user-friendly controls; FFL transfer required.