I can understand your frustration at Kahr's response, you'd think they would be a bit more helpful diagnosing the problem. With that said, I'm a Kahr fan and found the kahrtalk forum to be extremely helpful.
You might try #2 in the following link paying particular attention to "blowing out" the striker channel.
http://www.kahrtalk.com/showthread.php?1521-Proper-prep-of-a-new-kahr#2. Clean your new gun; don�t assume Kahr did it. They don't and there could be crud in places where it should not be. Take that slide off and look for the little hole in the bottom of the slide. That is your striker channel clean out hole. Insert your spray cleaner nozzle in there and spray away. Fluids will come out both ends.
Now, with one finger, pull back on the striker at the back of the slide and continue to spray in that hole and also spray clean from that breech hole also. You have now cleaned that striker channel without disassembly. DO NOT OIL THE STRIKER CHANNEL. Refer to the Kahr Tech section. Look for the sticky marked KAHR LUBE DIAGRAM. Point #9 shows the clean out hole and this is the best lube chart for any semi auto to.
Hope this helps!
Paul
