The SMR Custom Pre-fit Carbon-Wrapped Bartlein Barrel, chambered with an appropriately named B.E.A.R. or Barrel Examination Axis Review chambering process. When you see this logo or name, it guarantees the most accurate and repeatable indication and chambering process on the market, producing the tightest, smoothest, and best shooting chambers available. These custome pre-fit barrels are chambered in 6.5 Creedmoor and are for the Zermatt Origin and Aero SOLUS receiver platforms. They have 1-8 twist and 5/8"x24 muzzle thread. Mfg: Snowy Mountain Rifle Company