The cause can be too much extractor tension. I don't know if you ever heard of Cylinder and Slide in Nebraska, but they'll "Radius and tension the extractor for improved feeding reliability" for $35, but of course you'll have to pay shipping both ways. I just prefer to do it myself, as it isn't that hard to do. I posted this below and in another threads. A lot of people here like to remove a little bit of metal from the pin on the extractor for more clearance of the rim cartridge. My problem with that is that when you have a cartridge with a narrow rim you'll have too much clearance. But it is another option and those that do it have good luck with it. Here's a link for that and other options.
http://www.kahrtalk.com/showthread.p...tery-on-CW-380
A couple of 1911 gunsmiths have told me in the past that the wrong extractor tension can cause failure to feed or extract. If it's too much, it can cause failure to feed. If it's not enough, it can cause a failer to extract. In the below video at about 2:30 it talks about it. The video also shows how they measure the tension. The second link shows a extractor tension guage set they use in the video. The extractor in the Kahr pistol is adjusted by shortening the rear pin behind the extractor spring, like previously mentioned in a post earlier. I forgot to add, for the Kahr pistols, it should be about 2lbs tension for a 9mm and about 2 1/2 lbs for the 40. One also said every Kahr pistol he ran accross with failure to feed, had way too much extractor tention.
https://www.youtube.com/watch?v=3nnqKKWk2ig&app=desktop
http://www.jackweigand.com/etg.htmlThe cause is too much extractor tension.