I am not a metalurgist but I would guess that under the right (wrong?) conditions that any iron compound will corrode. Burning gunpowder is going to create all sorts of compounds that are deposited on the gun. Add in oils and salts from your hands, moisture from the air and who knows what will be created.
That said, stainless steel is going to MUCH more forgiving than blued carbon steel!
Just an uneducated opinion.
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