The CVA Accura MR-X is CVA's shorter-barreled Accura muzzleloader (the MR stands for "Mountain Rifle") and features a 26" Bergara barrel in either bare stainless steel or Nitride treated stainless steel. The MR-X is designed for hunters seeking a rifle that is both light to carry in the mountains and easy to maneuver in tight situations - like thickets or tree stands - yet still capable of reaching out there when necessary. Features.50 caliber1:28" twist rate26" threaded barrelWilliams Fiber Optic Sight