Full metal frame and slide with front and rear slide serrations (New Version aluminum light weight metal slide for best performance) Metal reinforced outer barrel, chamber, recoil spring guide rod, on frame safety, slide stop, hammer and trigger New version M9 Gas system for improved efficiency and reliability in full auto Stamped "STARS RPD" markings; Grip covers with STARS Insignia Electroplated black tight bore inner barrel Takes high pressure green gas, propane and red gas On frame safety and detachable magazine Tactical accessory rail FPS- 300-330