JF,
Thanks for the reply. Just wanted to be sure that you or anyone having a similar situation double checks to make sure. I have seen more than a few posts on various forums about "odd" marks found on cylinders, after firing.
I find it hard to believe that you would get enough movement in the yoke/cylinder/frame to actually imprint the cylinder. And as it appears you have not fired the gun, it is even more strange. This would tend to indicate that the proof firing at S&W caused these.
Not sure what the factory procedure is for clean-up after proofing, and possibly they thought it was just fouling, and let it pass out the door. There is no way I would find acceptable their answer that marring of the cylinder when shooting the gun is normal or acceptable. Not at that location.
Good luck getting it cleared up with S&W.
Craig