When you polish the feed ramp on a 1911 or any other pistol all you are doing is smoothing out any machine marks. Just don't change any angles of the ramp by using a power tool and gringing wheels. All you really need is fine garnet paper and a dowel of close to the same radius as the present ramp size, some time and elbow grease. Take your time and go slow. You can't polish backwards to put metal back on you took off.
Ne Conjuge Nobiscum
"If there be treachery, let there be jehad!"