I was hoping Greg would pop in on this one. I don't totally agree with kwh. It shouldn't be maybe but I have heard of lots of them chewing up guide rods, mostly cosmetic but a roughness too.
There are upgrade guide rods, stainless that help with that.
I don't know that I recall ever hearing it causing a malfunction. They still work just look ugly.
I do agree 100% with kwh in that contacting Kahr is a fine idea, see what they say, they may send you a new one.
If it's running ok otherwise I'd be reluctant to send the gun back. If it is balking, off she goes.
In Memory of Paul "Dietrich" Stines.
Dad: Say something nice to your cousin Shirley
Dietrich: For a fat girl you sure don't sweat much.
Cue sound of Head slap.
RIP Muggsy & TMan
"If you are a warrior legally authorized to carry a weapon and you step outside without that weapon, then you become a sheep, pretending that JOCKO will not come today."