I have two 18" AR-10 tapered barrels in .308. Both appear to be ballistic advantage barrels by their profile but they have been coated black. One is fluted, one is not. I took them in on trade and ended up not needing them. I assume they are used but if so, they appear to have an extremely low round count as they are exceptionally clean.
Fluted for $200
Non fluted $150
$300 for both
!