my rankings of ar15 in order are:
rra if you want tack driving for reasonable cost bcm=colt but i lean bcm for shtf.
you did good picking the colt. they are great guns
"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...
"I crapped my pants to avoid the draft!!" -Ted Nugent