Not all feed ramps need to be polished. If you fire quality ammo with good quality barrel and upper, you might be good. If you reload and like to try different projectiles, cast your own or you are having feed issues, good idea to polish them up.
When I polish feed ramps I do it with the barrel removed from the upper. I am not going to risk screwing something up on the upper. It is more work to remove the barrel but worth the effort for a better finished product.
Here is a before shot:
Feed Ramp after polish and clean up:
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