I saw this same gun listing. It looked to me like leading, but I could be wrong. I had very similar marks on my cylinder from using Ultramax ammo (I don't get it from Black Hills ammo, which I use now).
I was able to remove it - it really did look like scratches at first, and I read through several forum posts to discover that it was just lead residue. I saw several folks note that wasn't a big deal, and to be cautious how you remove it from a blued gun (you don't want to use lead-away clothes for fear of damaging bluing, from what I read).
I don't know if this is the case with this revolver, but to my naked eye and the photos it does look quite a bit like the lead I had on my cylinder after using that Ultramax ammo.