OK. Don't flame me. I am not an AR expert. Not a newbie but not really as experienced as you guys. So my question is this. If I have a low budget rifle assuming all things are in spec, how is it an inferior piece if I replace BCG, trigger. etc.? Maybe I don't get all of the subtleties but I want to learn. Maybe it's the forged vs. billet thing? This is an honest question and I am trying to learn.