Short story, I was shooting my KJW M700 one Sunday afternoon and ran out of gas to keep my mag going, it was empty. I didn't pick up more propane until Tuesday, filled the mag, it leaked bad! Fixed it with my automotive gasket sealer trick, but still, the point being........... never know how long an empty GBB mag can go without as til it leaks. If anything, I'd empty the entire thing of gas, and spray in a shot of keyboard duster to hold in place, keeps pressure in there and isn't flammable (been a while, but I assume it's not).
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