Orga Airsoft talk about the S&T Dungan Hyper Gas HFO1234ze + LPG as replacement of the HFC134a for gas blowbacks... "S&T Dangan Hyper Gas is attracting attention as a liquid charge gas to replace HFC134a (alternative freon gas)! Does it really have enough ability as a substitute for Freon? I would like to do a comparison test."