The exceptions I have heard on this board are the CW line had less than stellar quality control and itself was questionable. The other interestingly enough was the PM40. Early on the PM40 had some negative reviews because people were seeing the polymer rails expand causing slide malfunctions. This was early on in the PM40 release and was thought to be caused by the more powerful 40S&W cartridge. I had hoped they worked out the kinks and hadn't seen any complaints recently. I went with the MK40 because of those issues although the PM9 was tempting. I have also contimplated the P/PM45 but don't have a burning need right now.
So yes you could have a lemon, yes Kahr quality control may have burped, and yes the PM40 has had issues in the past but don't know if they were adequately resolved.
You might also take it back to Cabellas and compare it to the display model. Sometimes gunstores will "do the right thing" for the customer and exchange it. Most likely they will ask you to channel it through the manufacturer.