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I had almost the exact problem with my KJW M9 mag, popped the metal shaft holding the BB lips on and looked down and there was a piece of ratty oil soaked thick fiber wax paper jammed in the gold valve. Just pressed the valve in to release the paper and took it out with some fine tweezers, no idea where that paper came from, maybe from inside the gas chamber itself. Dont know if your problem is the same but figured it might help.
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