All structural parts have been rigorously tested to insure the highest possible quality and long life. Rifle also features a button pulled 1 in 10 twist rifled barrel with a nitride coated bore. Factory-installed Picatinny optic rail molded into the rear sight base. Gas port settings are properly drilled to ensure smooth cycling action with no over blow or short cycles. Rivet work is triple inspected and each rifle leaves the plant with a high degree of uniformity from rifle to rifle. Beautiful black melonite external finish. - Action: Semi-auto - Caliber: 7.62x39mm - Barrel: 16.5 Black Nitride - Receiver: Stamped