I'm seriously wondering if it has to do with the nozzle. If the nozzle doesn't seal properly with the hopup, that could be it. Hope someone has an answer for that. I love using the MP5 for CQB. Have 2 CQB games coming up in the next 2 weeks, but it's shelved until I ban get the issue sorted out. And don't see myself having much time to troubleshoot from now till then.
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