OK. I don't have an engineering explanation but have resolved the problem in one of my repros.
In the area of the receiver where barrels and watertable meet place gun in a well padded vice with jaws on top of barrels and bottom of receiver. Tigten vice very slowly to further engate barrels to water table. I heard a click and lever moved to right to open gun after removal from vice.
My problem was insufficient rim clearance. I bought a rim reamer and increased depth of cut. Problem resolved!!
Bob Jurewicz
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