The Mark IV features a simple, one-button takedown for quick and easy field-stripping. Features a lightweight, ventilated, aerospace-grade aluminum receiver and a tensioned stainless steel barrel, contoured ejection port, an adjustable rear sight and a factory-installed Picatinny rail for easy 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.