Wow! Great observation! I did not notice until you point this out. I loaded up a PMag and looked for myself, very interesting. I do not know if the PMag eliminates the need the M4 Carbine’s barrel extension feed ramps, but it sure does not hurt!
Finally, a great M4 / M16 / AR15 magazine, the PMag!!!
It is interesting. I’m glad you checked for yourself too.
And I agree. I’m not saying to ditch the M4 feed ramps… Just that the Pmag does a better job of “aiming the” feeding round in the first place when compared to the USGI mag.