Down side is you still need a bcg, charging handle and muzzle device. Those items are $$$ if they're marked DD.
Yea I was thinking about that but still its nearly impossible to find a RIS II rail and its pretty hard to find the #10point3inchmasterrace too and even if you found them I'm almost sure you would be over $600-$700 bucks. Personally I'd rather get this upper and throw in a PSA or AIM BCG, a Geissele charging handle and an AAC muzzle device which I would more than likely be running anyways.

