If you seriously want to backbore and lap the bores. Please send them to a professional. Dean Harris at Skeets in OK would be a great choice. He will tell you what can and cant be done, do it right, and likely cost a couple hundred per tube.
If the wall thickness is there to be able to backbore, then the pitting is just a cosmetic issue. You could save a lot of money and just leave it be.
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B. Dudley
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