Am I crazy or what? I was reading one of my gun rags (cant remember which one) I subscribe to more than I can read. ,,,,, Hear is the kicker, there was a article that a manufacture?? made a ar10 and you also got a ar15 upper with some kind of mag adapter so the smaller clips fit in the lower reciver of the ar10. I know I read this but cant find the rag it was in. I take all my old rags to the barbers for other people to read. if any body else heard of this, please let me know, I want one.