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the gun opened up after firing the first shot
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Typically, the lock block is retracted by the action of the thumb lever by means of a cam. The lock block is returned forward by a spring when the action is closed. If the spring weakens to the point where it fails to function during recoil, the action can unlock. It can happen with the best of guns, and spring replacements are common. A softer acting thumb lever may be a warning.