Pitting always looks worse than it is, generally speaking. You are looking across it, not down onto it. I have been amazed what can be completely removed by honing with proper equipment with only a few thousandths of material being removed.
I can certainly saw that any usual amount of pitting near the breech will not cause any safety concerns. Out in the thinner areas of the barrels is where it can be a concern. Careful measuring with a good wall thickness gauge is the only way of knowing, and even then it only gives you an idea of what is going on.
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B. Dudley
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