If you go to gunshows around OH look for a guy Tony's Custom Uppers, not only does he make customized uppers, but he builds, and customizes AR-15s you basically tell him want you want and hell do it for you. check out his website tonyscustomuppers.com theres not much on the page but hes got a lot of stuff he brings to shows, hes outta delta, OH. Check him out see what you think.
Beware the cult of purity/
I've made my choice...666