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If it is currently shooting well don't bother, ask for a relief cut when you have the crowns cleaned up/recut at some stage.

If you are considering changing a muzzle attachment or if you have any...

As a machinist and gunsmith Im with Mimms2 on this. Always have a relief cut and a shoulder.

I normally get stuff like this in my shop when the owner or new owner wants to fit a new/another muzzle...