You can see that the rib extension is lifted from the barrels. The solder had previously failed. And there is evidence of corrosion. It looks to me like it has been a victim of some shoddy repairs that have stacked up over time and led to the current issue.
On these, the retaining screw does nothing to actually hold the plate against ejector forces. It is just there to keep the plate in place in the dovetail. The actual dovetail is what holds it in . This is a failure of the extension material itself. Apart from the 28g repros. This is a pretty uncommon thing.
“Simple” Replacement of the whole rib extension is something that is easier said that done.
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B. Dudley
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