To damage the integrity of the slide, the pitting would have to be to a depth of half the thickness of the metal, be over a wide area (maybe a 1/2 inch circle), and in a high stress area.
A slide eaten away to half its thickness in the area of the locking lugs would be questionable. Frankly, I have never seen any rusting that extensive in a functioning gun, only in "dug" relics.
Jim
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