I'm with the others if it's not shot out at this point keep enjoying it, however, with an eye to the future I'm a fan of the Ballistic Advantage Premium Series barrels.

With the Premium series you get a mid-length gas system with a pinned BA gas block included. You also get the Hanson profile and the .223 Wylde chambering- in my opinion an upgrade from 5.56 NATO. I just finished a lightweight build using the .625 barrel and it is impressive. These are great barrels with a Sub MOA guarantee with appropriate ammo. The twist rate is 1:8.

Granite Ridge Outfitters is selling these barrels along with a VG6 muzzle device of your choice for $199 shipped to your door. This deal was a no-brainer for my build. Faxon are also good barrels, I used one in my 9mm build but I'm really impressed with BA as far as the quality and features you get for the $.