If barrels are “set back” then that area of the rib extension will open up. It is just a fact of the matter. And most would not want to mess with the super delicate work of welding a rib extension in that area and refitting it and potentially having a real mess on their hands.
In an ideal world when tightening a gun up, one would make up for exactly the worn material. But in reality, it ends up being adding more material than needed and then fitting accordingly. Once the hook is good, the breech of the barrels is fitted, and then the extension ends up with that gap.
One may wonder how the new guns are so precisely fitted. Yhe barrels were first fitted to the frame with no rib extension on them. Then the rib was cut back and the fitting of the extension was a separate operation after the fact. So, no they were not having to fit the hook, breech face and extension at the same time like we have to deal with today when putting back on face.
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B. Dudley
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