I am driving myself nuts trying to see if I am better off sticking with 5.56 since I already have completed lowers or should I get a complete Bravo AR10 that is a .308 People keep telling me the .308 is really designed to be used with a scope and long distance, that you are not going to use that for close quarters. For 200 yards or less they say 300 blackout or 7.62x39