ive got bcm dpms RRA colt. recievers dont matter too much unless your going with a super accuracy type build and even then the upper is all that matters and it doesnt make a huge a diff.
long as its milspec or better and made out of 7075 aluminum it really doesnt matter other than how much you wanna pay for the verbage on the side
"Gun control: The theory that a woman found dead in an alley, raped and strangled with her panty hose, is somehow morally superior to a woman explaining to police how her attacker got that fatal bullet wound." L. Neil Smith
The problem with being stupid is you cannot simply decide to stop doing dumb things...