Probably not what you want, But it very user friendly and requires very little maintenance. Try a antique plum brown. I've done several side by side and one over and under. It looks good and you don't have to do anything to it other than wipe off the grime.
I'm in the process of refinishing a single shot10 gauge. Just waiting on it to warm up so I can get the old blue off. I don't have a indoors shop.
All that's required is a propane torch and sponges, and be very close to a water supply. I do it in the kitchen sink when the wife is gone. Takes about twenty minutes for a side by side barrel. Steel frame is a little more time to heat. But about15 minutes. Set over night hanging over paper towels to catch the oil drips. Wipe off the next day, good to go.