If S&W doe the refinish, it'll be gone with the polishing they do as a standard step in the refinishing process.
If you want to do the polishing and refinishing, the marking can be removed cleanly by hand methods.
It doesn't look very deep, so I'd stay away from taking even a very fine file to the area. I'd go right to grit paper,,about 220 or maybe heavier like 180 if the 220 doesn't take it down right away.
Back the paper with a wide smooth file to keep the area flat and smooth.
Work the area with the curve of the cylinder. Criss-cross the polishing marks slightly so you can see where you are removing metal.
This also makes you able to see where you have removed the coarser grit marks completely when you go on to the finer grits as you polish further.
Once the damage is gone, it's just a matter of how bright you want to polish the area up to.
If you are trying to match the surrounding areas and match the bluing that will be done, that takes some experience with both the polishing and bluing techniques.
If doing a full polish and then reblue,,then polish the complete cylinder to what ever degree you want.
Then go on to the frame and other parts as well.
Then re-blue.
If you have a belt grinder and experience with it in polishing flat and curved surfaces,,they are very useful at polishing the cylinder and other pieces.
BUT,, you can ruin a cylinder in quick order if not careful with one.
It would seem to be easy to mearly glide the cylinder surfaces around as they touch the grit belt against the backing (platen) on the machine.
But if you do that w/o compensating for the flutes not offering any support as you happily turn the surface to the belt, you will end up quickly funneling out the flute edges on each of them. Especially at the breech end of the cylinder.
It takes practice to polish w/ any power equipment while holding the parts by hand.
However the results can be outstanding. Just look at any pre-war or early postwar Colt, S&W, Winchester, etc.
Just stay away from soft wheel buffer polishes. They have made a lot of shiny metal over time, but a lot of ruined polishing jobs as well.