Keep in mind that when we talk about "polishing" gun parts we DON'T mean "like a mirror".
What we really mean is that we SMOOTH the part, or "hone" it.
Your first question is, "Do I NEED to do anything". In other words WHY do you need to do anything?
Is your gun having reliability problems?
If not, it doesn't NEED a "polish" job.
The idea is to remove or level any machine marks or roughness that might cause problems.
Where people get into trouble is in trying for that mirror-like shine, and removing metal or changing angles and surfaces.
What you want to do is just barely enough to smooth the part, and nothing more.
So, why do custom guns have mirror-shiny feed ramps?
Customer demand.
When we do the proper "polish" job, the customer sees just a smooth surface and not a mirror shiny one.
He figures we ripped him off. He paid for a "polish job" and figures we didn't do anything.
So, since the customer expects to SEE a mirror surface, we have to do it for him.
To do a REAL "polish" job, you can wrap VERY FINE sand cloth or crocus cloth around a wooden dowel rod and use that to JUST smooth the surface.
Keeping in mind that the Dremel tool or flex-shaft is a fast way to a ruined gun, IF YOU'RE CAREFUL you can use a hard felt buff tip and polishing media to lightly "polish" the ramp.
Again, don't try for a mirror shine.
Don't change anything, don't remove ANY metal or change the shape of the ramp, don't try to "mate" the feed ramp on the frame with the one on the barrel.
You should have a 1/32" gap between the frame ramp and the barrel ramp when the barrel is all the way to the rear and down against the frame.
This means you should have "about" a 1/32" "step" between the frame and barrel ramp.
In other words, DON'T CHANGE ANYTHING, just smooth the surfaces up. Forget the mirror shine.