I've always liked the additional milling on the muzzle Smith did on the 622VR.
I've played around a bit making cuts on the muzzles on different guns. I have what started as an old used and abused 6" gun that I restored and tried my hand at making some muzzle mods. The look was close to what I wanted, but my methods didn't produce the quality of cuts I wanted. I actually made the cuts with a router, not bad for using the wrong tool, but hard to make accurate, clean cuts.
I finally got my mill back together and all set up, did a few practice runs on some parts gun frames where they had been cut in half. Did just the narrowing cuts on the 422 4.5" "Crisply Critter" build I did.
And now finally re-cut the 422 6" muzzle. I'm very pleased with the results now, just need to smooth, blast, and Cerakote.