you don't know if the 2 gouges on the bullet are from the mag feed lips, or from the M4 feed ramps of the barrel extension.
Metal mag feed lips usually carve out gouges on the brass, not so much the bullet projectile.
you probably have some serious sharp edges on the barrel extension feed ramps, left over from the usual machining. This is common with most AR barrels. Those sharp edges can be deburred and polished so you don't get gouges on the projectile, but that usually has to be done before the barrel is assembled to the upper.
The Other Site: how to romance your AR build
I'd guess that after 500 to 1,000 rounds of shooting, those sharp edges may just get "deburred" from normal usage. plus-or-minus. copper & brass wearing on steel.
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