No - this is normal. All semi autos get that wear - usually in the same spot, bth on the top and the bottom of the barrel.
This occurs from the slide and the barrel rubbing together, as the slide goes back and forth.
ALL semi autos get this to some degree.
I am probably the biggest "don't get the gun scratched" guy here - I go out of my way to not scratch up my guns. And, my carry gun is hard chromed, so it won't get holster wear.
However - this is 1 part of wear that you cannot avoid unless U don't shoot it.
U will also get wear on the top of the barrel block (the part of the barrel you see when the slide is closed).