I’ve got a rossi single shot that I just got back from JES rebooting it to 357 maximum. The only problem I have is that I have a little surface rust on the barrel and am looking at options for revisit g the outside of the barrel. Currently I believe it to be a black oxide type finish. What are your recommendations? Looking for something durable and simple. Doesn’t have to match perfectly. But I would prefer to just do the barrel so I’m not planning to paint the entire gun. What type and who can do it well? DIY options with good results?