Type: BB air pistol. Manufacturer: Cybergun. Model: Sig Sauer X-Five P226 Open. Materials: 99% all metal build. Weight: 2.86 pounds. Barrel: 4.4 inches, brass, non-rifled. Propulsion: CO2 x1. Action: Semi auto blowback, double and single action. Ammunition Type: Steel BBs 4.5mm. Ammunition Capacity: 18 rounds FPS: 330 This Cybergun BB air pistol is styled after many modern blowback Airsoft pistols, this means it functions very similarly to the real steel. It is a very hefty gun made almost entirely from metal and has a very snappy blowback action which adds to its shooting realism. Even the magazine looks and feels like a real 9mm magazine with similar weight and dimensions. The Cybergun Sig Sauer X-Five Open version shoots even more accurately than the non-sight rail version because of the addition of a Red Dot scope helping the accuracy! Both the regular version of teh Sig Sauer X-Five P226 and this "Open" version are absolutely great air pistols but for the extra $10 price tag you get some really nice additions to this pistol including an adjustable rear sight. Read full article here: https://www.replicaairguns.com/2011/8/6/cybergun-sig-sauer-x-five-p226-open-co2-bb-pistol-review.html