The PS features Hatsan's FAST Loading System and Smart Valve Piston technologies. The FAST Loading System enables faster and easier loading with one hand and without the need to change shooting position. The loading switch acts as both a carrier latch release for loading and the bolt release when the bolt is locked back. This gun's Smart Valve Piston will cycle 7/8 oz, 2 ?" up to 3" full magnum loads, credited to its self-regulating design. This patented design is so reliable that one can mix heavy and light loads in the same magazine without a hiccup.