The threads in this action aren't metric. I had this problem come in earlier this year. I believe I used a 1/4-20 tap (the receiver is threaded 20 threads per inch) to act as a thread comb. It takes a while, and a bit of effort, but you can clean it up that way. Just put the tap in the receiver, and start scraping back and forth around the inside of the action. It'll smooth out.
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