A $200 DiamondBack Armalite AR10 .308 Lower - Blem was on sale for $50 and I couldnt resist. Question now is, an upper receiver. I cannot find for the life of me an upper in the Armalite style (besides the $300 one from armalite.). My question is will the DB10 upper work on it or is there someone else making the Armalite pattern. Thanks all.