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Is it possible your hop-up unit isn't being held in place, or is flexing against the pressure of the magazine from below? It would only take a tiny bit of movement to keep the bb catch in the mag from opening up, there's surprisingly little room for error there. just a thought.
Also double-check that there's enough backwards force from the little spring on the hopup unit, without that the hopup can move around. Usually that just ruins your airseal but I suppose if there were enough tolerance for the tube to move in the top of the magazine it could affect that bb catch opening up too.
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