all i know about kahr's service is they usually make an honest attempt at fixing anyone's issues from what i have read and talked about with kahr owners.
They do, and they get the chance to do it a lot. I carried a MK40 extensively, it had a premature slidelock issue which I fixed. Lots of Kahr .40s have premature slidelock issues, that;s why they keep messing with the spring design that tensions them down. Other than that the gun was reliable.
K40, not so much. I bought it unfired from a guy that had gotten it as a warranty replacement for a PM model. Locking area of the barrel was peening back within several hundred rounds. Premature slide lock as well. Kahr put a new barrel in, did not cure the premature slidelock, I cured that, tested it to be reliable, sold it.
I own 2 glocks currently, used to own 4, yes I broke one, yes it took 40K rounds in 1.5 years to do it. Way more reliable guns. Point of fact the broke Glock was running fine when I found it to be broke, frame rail recall deal.