Dont rule out DPMS "Panther Arm's, they make some outstanding products, I use one of their bull barrel 20" uppers for cyote hunting, groups sub-moa at 100yds, a dime covers three shots, cant ask for anything better " off a shooting rest", offhand I can keep it at an 1 1/2" on my good days, " age is catching up"!. They have a complete line of AR-15s, AR-10s and several caliber choises, from entry to competition. Tell the JAR-HEAD U-RAA from me!!!.