If I recall, the new bolt design had not yet come out, and a friend had precisely the same issue with a gun he left with me. It was the bolt, still engaged in the barrel lug, and due to wear of the offset pin, and bolt, rotating the top lever pushed the bolt ever so slightly to the side. In the end, and, as John suggests, I resorted to doing something I wouldn't ordinarily do. Putting the gun in the wood jaws, I placed a hardwood stick against the top lever and gave it a firm rap with the mallet. Opened right up, and continued to do so each time the gun was closed gently. On closing the gun somewhat more forcefully, it locked right up again.
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