Phenomenally successful, Chambered for 12ga, 3" or shorter; soft ergonomic pistol grip; Picatinny-style rail with adjustable rear rifle sight & fiber optic front. Super-strong action bar has been milled from solid steel stock and joins the power bushing in an interlocking fit. The extra-wide O-ring is secured in a channel forward of the gas ports, reducing slippage, wear and loss.