I bought four of my Criterion Pre-fits from James at Northland Shooting Supply. He is great to work with! I bought two 6.5x47L barrels, one year apart, used for PRS/competition, and two 6.5x284N, three years apart, used for LRH. Being quite picky about my 6.5x284 chambers, James kindly sent a copy of the Reamer blueprint/spec they use. With both the 6,5x284 and 6.5x47 Pre-fits, the finished chambers were identical. Once headspaced/mounted, I was able to use the same FL dies for each cartridge without adjustment, and the throat dimension with each pair < .002"! Comparable accuracy was achieved using the same load parameters/cartridges. The two 6.5x284 barrels/nuts were supplied with a Cerakote finish, perfectly applied in an attractive smooth matt finish. No, I don't work for Criterion……