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hawk84
10-15-2009, 3:51 PM
I have noticed that when I eject an unspent round from my AR that there is a nice little cut/grove in the copper jacket

is this normal?

ar15barrels
10-15-2009, 4:03 PM
That happens when the bullet is feeding.
If you were to catch one of your fired bullets without damaging it, it too would have those marks.

hawk84
10-15-2009, 4:13 PM
i figure its rubbing over the locking lugs correct?

ar15barrels
10-15-2009, 4:29 PM
i figure its rubbing over the locking lugs correct?

Yes.
It rubs on the lugs either side of the feedramp in the barrel extension.