I just spoke with Luke at Larue, and he said that the Armalite and Noveske uppers WILL fit their lowers. This is really quite awesome. I have always respected Armalite guns, but I did not want to be locked into their proprietary magazines. Now, the problem is solved. I will be placing an order with Larue in the next few days. Now the dilemma is what barrel length to get? And, should I get the PredatAR? This begs the question: Why would you want an Armalite upper when Larue is the best? In case anyone is wondering, the wait time for a Larue OBR is is 12 weeks.