Precision-built SIG ASP pistols and rifles depend on quality ammunition and fuel to perform up to SIG standards. And a higher-quality, cleaner gas in a superior-engineered cylinder can influence the lifetime and performance of any airgun. Investing in SIG premium cylinders is a simple way to ensure longer-lasting, SIG precision performance. Please note: We cannot ship any CO2 via air services, therefore no shipments to Alaska or Hawaii.