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Perhaps a hop up sealing issue with your gb?
Hop up rubber is fine I'm assuming?
No cracks in the nozzle, does the nozzle have an o-ring?
Is the pistonhead okay and sealing inside of the cylinder properly?
You said your friend is good with guns, I'm assuming you guys tested these things for airseal but it's my 2c
Last edited by Theesire; January 2nd, 2016 at 23:55..
Reason: typo
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