Inspect the seal between the nozzle and the mags. Are the magazines sitting too low? It might be a magazine catch issue. They might also be sitting too high, but that's rarer. Try to push the magazine up with your hand while firing and see if its better or worse. Does the magazine have any play in the magwell?
Another possibility is that there is something impeding the movement of the valve knocker. Or one of the parts linking to the valve knocker is damaged.
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Keep quiet. Sound travels faster than BBs.
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