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Not enough air pressure I think. Mine does that when it drops under 1000 psi. I'm not sure if that's supposed to be that way though. I don't think it creates enough pressure to blow the bolt back far enough to catch or something so it just keeps going back and forth. Also I think it only does this when dry firing for testing. If there is a paintball in the barrel there should be enough pressure to blow the bolt back.
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