The only rib issue that I have noticed on a few Ithacas/Ithaca Lefever seems to be very back of the top rib lifting up where it meets the extension. But I have personally seen more cracked frames on flues guns than I have with rib issues.
Not that the frames cracking was a real issue if people would have just used the loads that the guns were designed for.
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B. Dudley
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