Heizer's 'Pocket 45' pocket pistol is constructed of aerospace-grade stainless steel with a fixed barrel for less moving parts and a snag-free design for conceal carry. This ultra-slim semi-auto is just .8" wide and weighs 25 oz. With it's revolutionary barrel-under the guide rod configuration, less recoil is felt by the operator. Chambered in .45 ACP, the PKO carries a 5 round capacity with the flush magazine.