Flitz on a piece of paper towel
will remove those rings from a revolver's cylinder face. I tried it once... I was amazed, ends up looking newer than new... and I will
NEVER do it again.
The next time you shoot it, they'll be back. Removing them with Flitz does mean that you are using an
abrasive. I did the math. It was a lousy exchange. I learned from the experiment and it's now in my past.