I have a stainless steel Preferred barrels 300 Win Mag 3.600 Match chamber 1:9 twist #3 contour (Super close to 3B contour) finished @ 24" Threaded 5/8X24 with contoured brake. It has less than 40 rounds though it and have a Preferred's load data and targets that back up its accuracy. I am going with a lighter setup with a proof. This will fit the ruckus, tenacity and anti. $520 shipped