I've had my P380 since 2010. I own 3 poly Kahr's and two steel Kahr's, I haven't had any issues that required kitchen counter smithing. My PM9 and CW9 have been excellent from round 1. I followed Jocko's break in on the Kahrtalk forum on both of them.
The P380 can be picky on ammo, especially JHP rounds. The design is pushing the limit of smallness. The stroke of the slide is so short and the feed ramp so steep that wide mouth JHP ammo like the Winchester PDX doesn't feed in mine. The Hornady FTX or zombie ammo has a narrow profile and feeds great in my P380. I had some flat nose Winchester FMJ ammo that also didn't work, but most of the others I have tried are fine.
GLOCK Certified Armorer, GSSF member, NRA Life Member
Currently: 17, 17C, 17L, 19x2, 20, 22, 23x5, 24x2, 34x2, 35+1, 43, AA LE 17-22 on G31 frame, DDLES 9mm SBR and 16" rifle
Have owned: 21, 26, 27, 29, 30, 31, 32, 33, 36, 42, Olympic KGL9