Well I don't know where my head was but I thought I was looking at a pic. of the top of the gun.
The marks on your chamber almost have to be from the factory and as you said, I can't see how it could be from firing the gun.
The barrel assembly does not move the way the marks are showing especially that far back or that high on the chamber area.
Thanks. It's simply a cosmetic issue but I would like to put my own scratches on it.
S&W has offered to take the gun in for an exam and I counter-offered to first send in pictures.