Game Changer Universal Rimfire Compensator/Brake for Ruger Mk III/IV, 10/22, and Most 1/2x28 Threaded Barrels

Game Changer Rimfire Compensator
  The Game Changer has gas ports on the top and sides so it stabilizes the muzzle and virtually eliminates muzzle rise. With no ports on the bottom, it's important to mount the game changer with the ports side up. This is accomplished with Do-It-Yourself ingenuity: An O-Ring alignment system provides the friction and alignment to keep your Game Changer aligned with the bore and straight up and down with it's gas ports.
  1/2 x 28 Threads - The Game Changer is 1.0" in diameter and fits most pre-threaded rimfire barrels including EABCO Accuracy Barrels, Tactical Solutions, Volquartsen, Ruger factory pre-threaded barrels, etc. Any rimfire barrel that's threaded 1/2x28 should fit.
  1.0 inch Diameter - Fits flush with 1" bull barrel Ruger MK III and 22/45. Fits a little oversize on .920" target style 10/22 barrels.