This muzzle brake is a scaled up copy of a real '74 Brake. It's threaded to M22x0.75 to fit the factory threads on the 12 gauge shotgun barrels. They are marked "U.S.A." or "Made In USA" and count as a compliance part. They are designed to work with all loads from slugs to shot.

This brake can be indexed by using teflon tape, or you may want to pick up one of my Muzzle Nuts. I also have Thread Protectors available as well.