Be sure of proper fit and seal with genuine powerlet 12-Gram CO2 cartridges by Crosman. Exacting tolerances ensure consistent performance in virtually all gas-operated guns. We can not ship CO2 using air services. Please consider this when you choose a shipping method.Crosman invented the CO2 powerlet and is the recognized leader in this field! Put Crosman 12-Gram CO2 powerlet in any airgun that uses 12-Gram CO2 cartridges.