Personally, if I were wanting to only own one AR, I'd opt for a RRA with a SS standard weight 16-18" barrel with a 1/8 twist and either a mid-length carbon fiber forearm w/ Weaver gas block or 1/2 quad aluminum forarm.

I'd stick with my EoTech as the primary sight but a nice 1.5-5x to 3-9x scope would make for a versatile back-up.

Biden's most truthful quote ever came during his first press conference, 03/25/21.
Drum roll please...... "I don't know, to be clear." and THAT is one promise he's kept!!!