Kahr's QC is unacceptably poor, especially given the prices they command. The guns do not receive adequate final finishing. It is very common to find burrs and prominent high spots on the slide rails, the barrel, and the frame rails in the dustcover, and the polymer trimming is very sloppy. I've seen several with poorly-milled dovetails (including mine). The original barrel in my Kahr came with a very poorly-cut crown. The mags seem to be welded and crimped by kids failing their sixth-grade shop class.
Except for a little sweet spot between 150 and 275 rounds where everything worked well, my P380 has been a nightmare. Four trips back to the factory and it's still not reliable. The Kahr gunsmiths are either clueless or profoundly disinterested in their work, because the gun usually comes back with at least one of the problems it went in with -- plus an exciting new problem!
Out of the box it had very poor accuracy due to what was an obviously poorly-cut barrel crown. I imagine the ridiculously large burr on the on the left face of the barrel hood could have contributed to inconsistent lockup as well. The gun has been very accurate since the barrel was replaced. That's about the extent of my positive comments for it. Oh, and the trigger is very smooth, and it's quite comfortable to shoot.
Every part in the gun but the stripped-down slide has been replaced at least once. The first frame cracked, and the second had to be replaced because it was "out of spec."
As for all of the problems the gun has had, it would be easier to name the ones it hasn't. At various times, the gun has suffered (1) failures to feed, (2) failures to return to battery, (3) failures to eject, (4) the aforementioned accuracy problem, (5) light primer strikes, (6) a broken mag release, (7) dropped mags with each shot (after the broken mag release was replaced), (8) the slide locking back prematurely, (9) slide not locking back on empty mags, and (10) the aforementioned cracked frame. I've probably left something out. Oh yeah, (11) because of the poorly-milled rear dovetail, my rear sight sits a bit sideways. When the feeding and ejecting problems get (temporarily) solved, then the light strikes and slide lock failures spring up; when that gets fixed, the mag will start dropping with every shot. It's always something like this. My P380 is the whack-a-mole of problem guns.
My warranty expires later this year, so I'm going to see soon if I can harangue Kahr into sending me another shipping label for the gun.