So I just ordered this upper on friday. I'll probably order a lower in the next few days. I've heard good things about CMMG, except about them responding to emails. I've hared that they can take their sweet time getting stuff done and shipped too. Nonetheless, I'm excited. The purpose of this rifle is just as a simple, functional rifle. I'm going to stick with an A3 rear sight and nothing else too fancy. If I really get the itch to shoot long distance with an AR I can always use my dad's CAR A3 HBAR Elite.