This is an issue that is not uncommon with rotory bolt locking guns such as the NID, Fox and Smith. The bolts wear in sometimes to where the forces of firing wants to lift the barrels and open the gun. Replacing the bolt or reworking how the existing bolt is bearing on the locking surface is the way to fix it. Stiffening up the top lever spring can sometimes be a reasonable stop-gap.
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B. Dudley
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