I should add that the threaded barrel is certainly not going to stop me from buying a Kimber.

Does anyone know what threads they are using? 1/2x28 is mighty thin on a factory 84M barrel at 22 or 24" and doesn't leave much shoulder, so I'm wondering if they pressed on a shoulder or belled the muzzle out to a larger contour (ala Rem Model 7 300 Blackout) to fit a larger thread?