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