As title states, I have an Aero Upper all built up but have a 260 Rem Barrel getting some work done but I am looking at possibly making another upper or a barrel in the mean time. Prefer 10 twist mid length gas and 16in I am not really too afraid of round count with a 308 unless you ran it as like a 3gun barrel or something ridiculous. I would like to have at least the bolt or BCG that was mated with barrel.