it has a 3.1″” barrel with a 16:1″” right hand twist. The receiver is made from 7075 T6 aircraft grade heat treated aluminum alloy. The Zytel polymer frame features ergonomic finger grooves and an integral recoil cushion on the backstrap. The slide is machined from stainless steel with a Zytel overmolded polymer extension for ease of operation. It has 3-dot sights with a windage-adjustable rear. This DAO has an internal hammer with inertial firing pin to prevent accidental discharge