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F-class muzzle brake definition

Since F-Class is subject to the High Power Rules, except where specifically defined, this is what I found:

Compensator or Muzzle Brake—A device such as an attachment at the muzzle, or pods provided near the muzzle, which release powder gases laterally or rearward in order to reduce muzzle jump or recoil.

Here is the full rule:

3.16.1 Compensators and Muzzle Brakes—The use of compensators or muzzle brakes is prohibited. An extension tube that has been installed on the muzzle of a rifle to extend the sight radius shall not be considered a “muzzle brake.” The extension tube must have an interior diameter of .5 inches or greater and may have 1/4 inch x 1 inch slots cut at 12 and 6 o’clock to remove cleaning patches. Threaded holes along the top of this tube for the installation of sight bases will be allowed. (a) Sound suppressors are not authorized for use in high power competition.
 

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