The B/C cloth works well for its intended purpose of removing lead on the front and inside the cylinder but no matter how mild it is, it's still an abrasive. If used on the frame of a stainless gun more than likely it will leave the metal a bit shinier than the rest of the gun which will more than likely look worse than the scratch you are trying to remove. Removing scratches on stainless guns is sometimes not worth the effort and winds up requiring a refinish of the guns finish if you want it to look like it once did.

If you don't mind refinishing the entire gun (many methods) then it will at least look uniform even if it does not look like it once did when new. After all scratches are removed and your finish looks uniform, then the process of acquiring more of them begins once again.