Assuming that you are talking about current Armalite AR-10s. Then the Armalite follower is different than the m-14 follower, though the m-14 follower will work, though it won't engage the hold open device. You still need to cut a hole in the left side of the mag body for the AR-10's Mag release. If you're using the Armalite followers then you also need to make a rectangular cut in the top of the mag on the back so the spring loaded catch on for the hold open device can actually engage it.
hope that helps