The Mark IV Competition features a simple, one-button takedown for quick and easy field-stripping. Features a lightweight, ventilated, aerospace-grade aluminum receiver and a slab-sided bull barrel; contoured ejection port; an adjustable rear sight and a drilled and tapped receiver for Weaver style or Picatinny rail mounting of optics; ambidextrous manual safety can be converted to left-side only with included washer; conveniently located push-button magazine release on the left side of the frame; Includes two magazines.