Originally Posted by
jmoser
All ramps should be smooth. Many mass produced guns including higher end ones have machining marks perpendicular to the feed axis.
These can cause visible copper build-up over time on the ramp, a sure sign of excess friction and an impediment to smooth reliable feeding.
All we are doing here is removing high spots [ridges] to give a smooth ramp surface. Should be done at factory but secondary finishing operations cost a lot and are frequently eliminated.
Altering ramp profile is another issue entirely but that is gonna take you a long long time using a felt bob with rouge or a fine cratex point. Unless you are using an abrasive grinding point you will burn out your Dremel before you remove enough metal to change the shape that much.