I've never heard anyone recommend a "break in" on a handgun. I must be out of touch. I've never done any thing with any of my handguns besides a quick field strip to verify function...then shoot the heck out of the gun(s).
I do not own a Kimber, Les Baer, or other top end gun but I do shoot H&K, Glock, CZ, Beretta, CZ, Walther etc....
I have never read this in any of the owner's manuals.
VF