I've been reading about some severe problems with the new Kahrs. Especially the polymer guns.
I had no problems out of the box with my Kahr P40. I got the PM40 shortly after it came out, mine had a defective mag catch (the metal insert came unbonded with the first magazine removal) that Kahr replaced in two days after I sent them an Email, been fine since.
Just before last Christmas I picked up the significantly cheaper CW9 and it self-destructed the first 25 rounds -- front frame rails warped. Took almost three months to get my gun fixed, but Kahr was very apologetic for the delay and said they'd gotten a batch of bad frames and I'd have to wait until the issue was resolved, they gave me a date when the dealer would have it back and they were 100% correct, the fact my dealer didn't call me like they promised, nor did then know they had it when I called, which is another story.
Bottom line, gun is working very well now, although I did have a few failure to fire (click not bang, all rounds fired on a second try) that seems to have resolved by time I'd finished the third box of ammo.
Neither my P40 nor PM40 needed any "break-in" whereas my CW9 clealy did. We've debated the need for "break-in" in other threads, but clearly it seems many Kahr and Kimber are too tight for reliability out of the box.
If you can conceal a bigger gun then no need to mess with the small stuff, but The PM40 I have in my pocket is worth a lot more than the bigger gun in the safe should the need arise. When you get guns that are very small for their caliber, you just have to accept the margin for error is greatly reduced and a number of them will have issues out of the box, but a reputable maker will make it right. A "full service" dealer is a potential advantage here because they will absorb the shipping cost should it need to go back, although I'd not call my service great, the small premium over gun show prices was a win here -- individuals really get gouged shipping a gun back for repair.
--wally.