Airsoft Master Gunsmith Gen 2 High Output Valve for Gas Blowback Airsoft Pistols
(Model: WE M9/M9A1)

"these valves work really well in my tm glock 17

"Tried this in an AAP01. There is no return spring in this, at the end of the second load up , It passes all the gas out the magazine . These guys at Evike returned my money in full extra fast, so I bought a co2 magazine instead. So far so good. More power and real fun. We’ll so how long it lasts! ( I don’t have an airsoft chrono but it puts quite a dent in my wood backstop, though not as deep as my Elite force 1911 co2.)