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8,953 Posts
1/2 - 28 is just a thread size. You can't really 're-thread' the barrel, but you might be able to clean up the existing threads to accept whatever you are going to put on it. How did it get *****ed up to start with?
https://www.amazon.com/Right-Hand-T...8&qid=1480969850&sr=8-1&keywords=1/2+-+28+die
https://www.amazon.com/Right-Hand-T...8&qid=1480969850&sr=8-1&keywords=1/2+-+28+die