Using an HPA system with a magazine is great for those that want consistent pressure and do not want to worry about how much gas a magazine can hold. A rubber o-ring is included with this nozzle so that you do not need to add teflon tape around the threads to prevents air leaks.
This item replaces the fill valve of magazines and is designed to fit Tokyo Marui gas blowback pistols and rifles.
It may fit other GBB pistols,
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