I've had a number of 9mm Kahr pistols previously (K9, MK9, PM9) and never had any issues with them as long as one follows the owners manual, in particular that the slide lock be used during 'break in' to chamber a round. I failed to do that with my first PM9, had malfunctions and got rid of the pistol only to buy another one (same malfunctions, then I read the manual), so it was an expensive lesson. Once everything is working as it should the overhand technique works just as well.
I will say that the all metal Kahr pistols break in much quicker than the polymer pistols. The trigger on a Kahr is very nice, but racking the short slide can be a challenge for some people. And DIY changing the sights is best left to the factory. Many gunsmiths won't even do it. Kahr apparently uses a giant press to install the sights initially.