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134a is a form of gas widely used in the sport of airsoft. Most commonly referred to as ;Green Gas", 134a is one of the weakest gasses available for airsoft guns. This gas is safe for use in all GBB and NBB guns and often contains a lubricant that allows critical parts of the gearbox to keep operating efficiently. Most eastern produced guns are only guaranteed by the manufacturer if you use nothing but 134a gas.