First, use Dykem or bluing of some sort for the bolt lugs. Then you can see where the Bolt & Receiver lugs surfaces are making contact. Then get or make some lapping compound and lap the lugs surfaces. I used several kinds of Silicone Carbide medium & Vaseline to make varying course to find lapping pastes. It works quite well. This happens normally over time. (A couple Thous. rounds), but doing it by hand works quite well.
Here’s a tutorial. (But don’t use the Dremel. I didn’t & don’t recommend it. That’s the point of varying level compounds.)
https://www.youtube.com/watch?v=xtBNkA5tMvw
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