In my opinion, the Criterion .308 barrels are the best of the lot. Their 18" .223 barrles are very good and for practical 3 Gunning, you can't outshoot a Cirterion nor the Nordics. The Nordic is my design, and their are a few little tweaks that make it better in terms of the gas system. They should be back in stock by the end of the month. There wil be some slight velocity and recoil impules differences between the two so if you are trying to match the primary ARs barrel, then I would wait on the Nordic. If the primary has somehting else, 6 of one, half dozen of the other.