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compression jamming... BBs are jamming due to misfeeds or not leaving the hopup chamber and the nozzle has nowhere to go... grinding noise is probably coming from preengagement happening since the air seal is greater than the resistance on the BBs being held in the chamber.
The piston is probably in some shit shape right now, maybe even the tappet fin. On top of that you have the sealing issue that's causing the jam. Could just be due to poor hopup rubber install or major air leak somewhere. Ever get it chronoed?
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I futz with V2s, V3s and V6s. I could be wrong... but probably, most likely not, as far as I know.
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