I am planning on building an AR308 chambered in 6.5 CM for long range shooting and potentially some PRS matches just to meet some more people and have some fun. Right now I am looking into a X-caliber barrel and a Criterion barrel. Currently leaning towards the X-caliber as it comes with a head-spaced bolt. Does anyone have any experience with either of these companies? I have only seen one or two reviews about these companies in the large frame AR platform and all were good but there isn't enough out there for me to be able to decide between the two.