My first was wasn't so hot, but I love my second one.
My first was an MK9.
The slide would often fail to completely close on a round. This still happened after a few hundred rounds, although it may have been better. It was always easily closed by a nudge on the slide rear. Still, it was nothing I wanted to deal with in a carry gun. I probably should have sent it back to Kahr, but I didn't.
I blame the dual recoil spring system for that. The shorter ones like the MK use two recoil springs- one coiled inside the other- similar to a Seecamp (in fact, I think they paid to use the Seecamp patent). The thing is, only one of the two springs was exerting any force in the last bit of slide travel. That occurred almost exactly where the slide would stop short of closing.
You could feel the difference when cycling the slide by hand. I looked at some others back then, and they were all the same.
I've heard that Kahr has made a change or two since, and they aren't like that, but I don't know. This was maybe four years ago.
I still wanted another.
Ordinarily, after having some trouble, I might have stayed clear of them. But I felt the Kahr was a one-of-kind gun, and a pretty specialized one. I liked the overall idea f apocket 9mm, and wanted it to work. I was willing to try again.
But I wanted a model with a single recoil spring.
I found, and got a PM9 Covert.
The Covert models used a short MK/PM-size grip with their "standard" length K9/P9 slide and barrel. This gave me a single recoil spring, but still had the shorter grip for pocket carry.
It has been fine, and has never missed a beat. After testing it out a while, I put it in my pocket and it's been there for the past three years.
It actually squeezed out my beloved J-Frame S&W from that pocket.
I can shoot it a lot better, it has better sights, I like the trigger better, and it holds more ammo. But the important thing is that I can shoot it better. Much better.
The bad thing is that Kahr has evidently dropped the Covert models. I've heard they were dropped, and the last time I checked their website- they were listed in one place but not in another.
But companies drop guns and bring them back all the time, and they could have done so already.
If not, and you want the shorter "pocket size" grip, you have to get the smaller slide also. If you want the longer slide, you have to get the longer grip (which I doubt will fit in jeans pockets). There are places out there shortening the grip frames to MK/PM length- at least on the polymer frame guns. Cylinder and Slide comes to mind.
I've heard of others having problems here anf there with Kahrs. I haven't witnessed any others, so can't verify. Ordinarily, I would say that if a gun seems to be having more trouble than usual, I would run from them.
But I think this is different.
We are asking this gun to do a lot. Think about it- The K9 and P9 shoots the same cartridge and holds only one round less than the S&W 39. It's the same when compared to the S&W 3913, Sig P225 and P239- all of which were, and still are, compact 9mms. The Kahrs are smaller than a Walther PPK and other .380s that were considered standard size for their caliber just a few years ago.
Its' a big jump going to a 9mm in a gun that small. That's why I cut them some slack, even though it took me two tries to get a good one (and I DID get a good one). So I look at the bright side of how nice it is to have a pocket 9mm that works and I can shoot almost as well as a full-size 9mm.