CVA Accura Northwest MR-X 3/4 x 24 Threaded Barrel 50 Caliber Tungsten Cerakote SingleShot Muzzleloader - 26in - The NW Accura MR-X Muzzleloader is the ultimate rifle for hunters wanting a compact design with increased BC bullets and velocities. Featuring a 26in threaded Bergara barrel. 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.