GHK M4 mag issue, please help doctors!
 

Recently got my GHK PDW GBBR with 3 new mags, but one new mag got a issue of gas escape right the way after empty, like the mag cannot hold the gas inside it, the gas escape the same time when I inject the gas, the mag is brand new never been drop! Can any doctors help me out about this problem? How to fix it? Thanks!

check that the valve is not stuck open. GHK mags have a tendency to get stuck awhile after use.

If you press on the valve on the rear of the magazine and it does not go forward/in it is stuck

edit: didn't see the mag was new but still worth a check =p

ya thata what id guess too, the vave is stuck open, tho that depnds onwhere the gas is escaping, if its comming out the top of the mag the valve is likely stuck if its comming out te bottom it is also likely a valve but its the fill valve or it could be the main seal, any/all of theese could be fixed with some lube if its the main seal there are a bunch of threads on how to seal that, if its the fill valve you may have to replace the vale if lube doesnt fix it.

Thanks guys appreciated it