For use with the POF-USA Triple Port Muzzle Brake.
I ordered a couple of these & will probably be buying a few more. My days of using crush washers are over. The finish looks great although they did have a few tooling marks on the flats, it’s under the handguard and out of sight in my case. For the price it doesn’t bother me in the least. It did fit over a medium profile barrel on my CMMG Guard where an Ebay jam nut at twice the price did not.