This '74 style muzzle brake is threaded to M15x0.75LH to fit the factory threads on the 410 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.

I recommend wrapping the barrel threads with teflon tape to index the brake. It's cheap and isn't affected by heat from normal firing.