I'm just gonna post this about ANY brand of GBB mag (or any gas mag for that matter):
ALWAYS keep gas in the mag. Don't worry about 1/4, 1/2 or full, any gas in there will keep the mag from leaking. Regardless of whom has told you what, fully empty mag have been proven to leak after a while (one of my KJW M700 mags leaked badly 3 days after it was left empty).
Personally, if I use a mag and empty the rounds, I'll leave it as it is til I load it again. If the mag was loaded full of gas and I didn't use it, I might unload the BBs if a few weeks til next game, but I leave the level of gas (in this case FULL) in there. I've never experienced a leak from a mag that was kept full. And I have six KSC G19 mags, two KSC MK23 mags, one KSC M11A1 mag.
I've learned my lesson, now it's your turn to heed my warnings and avoid my mistakes.
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