So, I bought a 1972 Ruger 77 roundtop on gunbroker this last week. It's in 95% condition, but it's the 5% that I need advice on. Right at the muzzle and on the front sight there is some rust that needs to be taken care of. I'm not going to take off the front sight, as that is part of the unusualness of the rifle, and partly why I bought it. I'm not sure steel wool will take off the rust, as it's kinda rough, but in total area, smaller than a dime. My thought is some fine Emery cloth to completely get rid of the rust, but then what? Which blueing product will best cover up the spot, and come close to matching the original blueing?