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WE M4 mag help

gorilla

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Hi, I have a few WE M4 mags which seem to have developed an issue. Once I fire the first shot, the mags vent all the gas out the barrel. Other mags work fine. Any help is appreciated 

 
Sounds like the output valve is a bit sticky.  You'll need to remove it and clean (possibly replace) the seals.

You just need a valve key like THIS.

 
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