KillStick (cool avatar BTW), but my impression from the pics, is that the polymer coating around the rail has separated from the metal - something very normal and the subject of many many posts questioning the quality of the gun. I have this on most of my new HKs. The polymer could have easily come off the rail during test firing at the factory giving it the "chewed up" appearance you see. It's tough to tell what the deal is with the white part (your pics are just too small), but maybe some of the polymer that came off the rail pulled some of the polymer off the frame exposing internal fibers right there at the corner of the frame. It's probably just cosmetic, not functional, but cosmetics on a new gun matter. I think you are right to ask HK CS to look at it. Hopefully they just take it back and swap it out for you.