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Some great work going on there.



If a gun tap would do the job for you (it is a through hole you're talking about if I understand correctly?) I see CarbideNZ have M5x0.5 for $14 and M6x0.5 for...

That's great info, thanks for taking the time to lay it out. I presume you haven't seen an issue with lengthening the chamber throat during lapping either?

I'll have to give it a try one of these...

Great description of your lapping setup. I've looked into bore lapping before but never actually done it. Considered it for my problematic grey birch barrel to remove the bore constriction, but...