Generally gunsmith's just dial in the receiver using a tapered bushing/rod that self centers in the action. The action is trued with dial indicators to have almost zero run out along the bushing/rod. Then they single point cut the threads slightly over sized. Usually a minimal amount, just enough to clean up the threads.
Then a new barrel is installed that has slightly large tenon diameter and matching threads.
There are several other steps that go along with truing a receiver, but that's the gist of the threading part.
I don't think I've heard of anyone truing threads on a receiver with out re-barreling.
Then a new barrel is installed that has slightly large tenon diameter and matching threads.
There are several other steps that go along with truing a receiver, but that's the gist of the threading part.
I don't think I've heard of anyone truing threads on a receiver with out re-barreling.

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