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On my M9 with the TM mag, if I press the base of the TM mag up into the gun and hold it there while I shoot, I tend to be able to get about 15 shots or so before the gas vents off. I've already determined that's because the KJW mag is about 2mm taller than the TM, so I think the valve and firing pin probably don't mate up right. I know it's a mag issue for me.
Of course, I can't say for sure it's your mag, but from my meager understanding of how GBB guns work and your symptoms, that's what it leads me to believe.
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