Yes, I know the AR-15 is supposed to be a workhorse and not a trophy, but I'm going to be that guy and ask about repairing some scratches at the bottom of the barrel that have been bugging me a little. They aren't deep and I probably got them from the barrel being propped on something when I was shooting it at the range. I've heard some people use aluminum black, but others say it's just a temporary fix. Is it worth even bothering trying to fix them?