He has some good videos/info (Iraqveteran).
I would caution that in the one you linked above, bore polishing compound on the lugs is safe enough if you have a sticky bolt issue. But where he adds the note about using a lapping compound I would disagree...
Polishing the lugs, without removing any material is OK, but using a lapping compound will increase headspace and you'd better know what you're doing if you're going to lap bolt lugs...
I would caution that in the one you linked above, bore polishing compound on the lugs is safe enough if you have a sticky bolt issue. But where he adds the note about using a lapping compound I would disagree...
Polishing the lugs, without removing any material is OK, but using a lapping compound will increase headspace and you'd better know what you're doing if you're going to lap bolt lugs...