My father and myself were having a discussion about AR's in general and he asked me whether or not you could use an AR-15 upper (5.56 NATO) on an AR-10 lower to sort of have the best of both worlds. I've crawled the net for a little bit on the subject and really I pull up a bunch of stuff on AR-15 conversions and not much on the AR-10 conversion.
My questions are: 1. Can you easily use your AR-15 upper on an AR-10 lower. 2. Do AR-10 5.56 NATO conversions exist and where are they?
Thanks for the help.