Put the dremmel away
The dremmel even on its lowest setting is too fast for polishing. A drill with a buffing wheel is a better tool choice. You can get the buffing wheel (3 graduated sizes) and a polishing compound at Harbor Freight for $6. It'll work like a charm.
The bad thing is when you try to shoot it the glare from the top will make it difficult to see the sights. That's why my Colt Gold Cup Trophy is matte finished on the top and polished on the sides.
"Socialized Medicine is the Keystone to the Arch of the Socialist State.” -Vladimir Lenin
"I predict future happiness for Americans if they can prevent the government from wasting the labors of the people under the pretense of taking care of them." - Thomas Jefferson (An early warning to Obama care)