Bought one of Bud's CM9 sale guns a couple of weeks ago. Did all the cleaning/fluff & buff things that Kahrs need prior to break-in. Fired 400 rounds thru it for the break-in: WWB, Speer Lawman, my own 124gr reloads, Gold Dots (124 & 124+P), 115gr. 9BPLE and HSTs (124 & 124+P). No issues other than with the HSTs - pull the trigger and get a click. As most know, some Federal primers tend to be "harder" than most other brands. That appears to be the case here as there is an easily seen indention on the primer, but no bang most of the time. Always a good idea to fire a fair amount of your proposed carry loads before thinking a new gun is good to go after break-in. Looks as if I'll be inventorying Gold Dots in addition to my old standby HSTs.
On another note, this gun is just about as easy to shoot and as accurate as my five year old MK9 Elite. Very happy to have added this one to my collection & the price was awesome.