As for the M4 feed ramps, just look at the design, in full auto things skip around easier, if the round from the mag chambers to high, it is not a problem, and It actually makes a lot of sense. The original M4's, the CAR-15's did not have M4 feedramps and were more prone to jamming than say a M16.
The M855A1 looks like a great round for the 5.56. Is there any truth to the tips damaging feed ramps? Down to 1900 fps range still performing well on gel.
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A note on M4 feed-ramps: The rifle will shoot fine even if the upper does not have M4 feed-ramps. My A2 has run for years with hand filed ramps and has had zero issues to date. M4 feedramps are not clone correct, but they will not negatively effect function if your A2 upper does not have feed-ramps cut.
I did need it very much, since i've never polished a feed-ramp before. Abbreviated, quick-and-dirty explanations don't work for me. My colt gold cup does not have a feed ramp. If used for its intended purpose, no screwing with the gun is necessary. Timothy Adams.