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Well, I didn't opened my gearbox, I didn't have the right size of screw.. yet it's a new one I got from Huang and I am receiving a M150 one in the near future. I guess it's not the piston issue.
I am now inclined to the air leak. I installed the rubber right, but since that's a G&G stock rubber from a plastic hop-up and I am using a KA metal hop-up, there may be some issues.
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