After a 7 month ordeal, that was supposed to take 10-12 weeks, I received my 6 ARC barrel from Compass Lake Engineering. Haven't put it together yet, as work stuff has kept me busy. Went to mock up my muzzle device to see how much timing it needed. Muzzle device will thread on properly and seat on the shoulder, as it has an inside relief cut before the threads start, but the peel washer that thunderbeast sent me with my muzzle device won't seat on the shoulder,as the OD of the barrel at the end of the threads is too large.