The SIG Sauer P226 air pistol uses a 12-gram CO2 cartridge. It features a semi-auto blowback design, a 16 round mag, manual safety, and fixed sights. The durable all metal construction with integral picatinny accessory rail and textured grips is built to last. This CO2 powered air pistol has been life tested for 15,000 shots!pbrThis listing complies with eBay?s air gun guidelines found here and I will only sell and ship air guns to buyers in jurisdictions where permitted by applicable laws - http://pages.ebay.com/help/policies/firearms-weapons-knives.html.