What do I do about corroded Milsurp bores?

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Attachment 121521Attachment 121522Attachment 121525Attachment 121523Attachment 121524So.. I have two old WW1 guns, and i looked with my new borescope and on one of them discovered really bad corrosion from what im assuming was corrosive primers (Enfield SMLE).

My Winchester M1917 isn't nearly as bad, looked okay with the naked eye but then with the borescope noticed minor pitting and some flaky looking fouling/corrosion. still learning how to diagnose these sad discoveries.

Also have a Garand from like '43, and the corrosion is also pretty bad but not as bad as in the Enfield. worse than the M1917.

Just as a control I even checked a new rifle bore in an ak i bought recently and it wasn't perfect either, but good enough i suppose. No corrosion obviously just has some tiny random nicks/marks/holes here and there from machining I'm assuming. and what looks like copper fouling but idk why that would be there on a new gun unless its from factory testing or is just the factory lubrication.

Basically I'm wondering do I need to replace the really corroded/pitted barrels? what are my options? Some people say that it doesn't matter and that they may still shoot well. I just want to make sure they are safe.
Would be expensive to replace the barrels. garand barrels can be found but have only seen 1 for the Enfield online, and thats not even including the price of gunsmith installation.

am happy with my borescope as now i can check bores before i buy, at least in person, but was kind of shocked when i checked the rifles i already have.
Any wisdom on this matter would be appreciated. thanks.

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