I've never polished my feed ramps, though I have filed them in on uppers that don't have the M4 ramps. Doing that obviously removes the anodizing, though I have noticed no ill effect. It absolutely has increased reliability though. some grendel magazines don't have the relief cuts forward of the feed lips, which can cause the cartridges to nosedive more. Adding the ramps helps there. I also use the SS CMMG followers in my 5.45 mags. the benefit there is that they are simply bent sheet steel. That allows you to adjust them to fit the mag however you like. In my case, I have them adjusted in a way that the cartridges strip from the mag straight forward, without any popup. They just run smoother that way, but they also require the M4 ramps, else they would simply just nose dive and fail to feed.
I guess the short of it is, if nothing else, I would advise at least cutting ramps in the upper if you don't already have them.
I guess the short of it is, if nothing else, I would advise at least cutting ramps in the upper if you don't already have them.
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