King Arms green gas For use with all green gas airsoft guns For airsoft use only 12 canisters per box 8 oz. Enjoy crisp blowback recoil with every shot with King Arms green gas. Green gas lets your airsoft gun fire smoothly during intense airsoft skirmishes. Simply hold the canister upside down and match the nozzle with the magazine port to use. Fill the magazine in short spurts for best results.$28 HazMat fee included in price. Ground shipping only. ATTENTION: The nozzle of this green gas canister is NOT compatible with the extended base magazine fill ports on the WE Full Metal 1911 MEU (WE-052a) & WE Full Metal 1911 MEU w/ Rail (WE-052b) green gas pistols.