Okay, caveat emptor I am not an expert, but I was doing some general reading as well as watching a bunch of the M4 earlier in the week, so maybe I can help. Hopefully.
From my understanding, and what was said, the reason for the M4 feed ramps with the M4, had to do with the shorter gs system causing a faster cyclic rate which caused the carrier to strip rounds before they were fully presented in the mag, or something to that affect. The solution came down to the use of a heavier buffer, or the M4 cut ramps. The argument being that both weren't needed, but Colt put them in anyway as an example of doing something. Personally, in an M4 I think having both is cheap insurance if both aren't needed, but neither here nor there for this thread. So in short, it should work if you are running a heavier buffer, from my understanding, and for the AR you are building no feed ramps would likely be correct. Again, am not an expert persay, and would welcome further clarification on the issue as well.
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