I've got a satin nickel Stoeger coach gun. It's fun, but it's a little short for sporting use and a little low-capacity for defensive use. In the interest of making it more fun and cool, I'm thinking of going NFA with it. So, what do I have to worry about when chopping a nickel plated gun? I'm not terribly concerned about aesthetics. I just don't want excessive chipping at the muzzle. Cold blue? Clear nail polish? Plasti-dip?