I have an almost new Ballistic Advantage 8.5" Barrel with low profile gas block and tube from a complete upper I bought at Curts in milwaukie. Fired about 40 rounds for the break in process and then converted the upper to 9mm so no need for it anymore. BA barrels have a sub-moa accuracy guarantee and it sure shows! Comes with a birdcage flash hider, gas block, gas tube, and nitride bcg for $180
