depends on where the scratch is and that will dictate what , and how one goes about it........on the rounds (say the barrel itself) you can use a small file file and blend in ( remove) the scratch, then using strips of fine emery paper, like you wouild "shoe shine" a pair of shoes,go around the barrel ,again blend it in, and finish off with a 3M Scotchbrite pad.......if its on a "flat" same principle, but have to use a "back up" flat end of a large file or flat piece of hardwood, wrap the emery paper around the end and blend in ,then finish off....quite easy and simple to do on any standard stainless steel finish..........gotta remember the surface of gun stainless steel is relatively soft and easy to scratch,mar, scuff, and nick,BUT cleans up quite nicely..........