i am embarrassed that i don't know the answer, but i don't. is a RDIAS legal to run in an AR-15 or does it need to be in a pre '86 M-16? NO, i am not buying one, i am not thinking of buying one, i was just presented with the question and i did not know the exact answer. any NFA guru's that can pitch in? i am assuming that since it is just a sear, and since it is registered, that it can be moved into any host, correct? or wrong? TIA!