Might be a Lothar, then again might be Wilson. I have 2 of them. Armalite spec'd barrels, and various suppliers stepped up to the plate. Either way, most likely a button rifled barrel that shoots and cleans up well.
Which of the 3 or 4 carbon barrel manufacturers makes the best barrel. I am wanting to build a 25 Creedmoor, 22" barrel and a rifle +2 gas system with a good adjustable gas block and a short piston action.