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Take the valve off the mag, probably just needs new O-rings
I've fixed a couple demon problems on gas rifles, if you can't get the answers you need from this thread, you can ship it to me. And if I can't fix it, I'll ship it back for free.
Put the stock stuff back together with the RA-Tech bolt, and just cycle slowly through the motions of it shooting by hand. That's usually how I diagnose all GBBR problems.
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