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Gunner 3 Port Muzzle Brake w/ MuzzLok The Gunner 3 Port Muzzle Brake is the ideal blend of usability, versatility, and recoil reduction. The 3 ports work to sequentially capture the propellant gasses and redirect them to the sides for maximum recoil reduction. On barrels of all lengths, the GUNNER reduces recoil by more than 50%! MUZZLOK Faxon's invented "Muzzlok" feature on this device allows for easy timing and installation of your device without the need for a crush washer or shims. By using the extension nut to adjust the length of the device, you can adjust the rotational timing. It is recommended that you tighten the device to the recommended to Mfg: Faxon Firearms