Ruger's Mark IV features a simple, one-button takedown for quick and easy field-stripping and proper chamber to muzzle cleaning. The recessed button in the back of the frame allows the upper receiver to tilt up and off of the grip frame without the use of tools. Its internal cylindrical bolt construction ensures permanent sight to barrel alignment, while the contoured ejection port and easy-to-grasp bolt ears allow for durable and reliable operation. The accurate sighting system features a drilled and tapped receiver for Weaver- or Picatinny-style rail. The Mark IV is a single action and utilizes an ambidextrous manual safety, push-button magazine release located on the left side, and an ergonomic bolt stop. Included is a washer and two magazines. This 22/45 model features a 5.5" bull barrel, polymer grip frame, blued metal finish, black synthetic grip, and a fixed front sight with an adjustable rear.