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I've noticed that too, sometimes I'll get a small leaking sound after filling, and it stops after a couple minutes. I've got 6 KSC mags for my G19 now, a couple have sprung leaks that I have either fixed with working oil in, one I replaced the square "O-Ring" in the base, another I used the gasket sealing stuff around the valve threads.............. all work great now. Once in awhile I'll over fill and get the slight leak sound.
Oh ya, make damn sure you keep some gas in the mags. Had more problems from storing empty than anything else.
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