The Beretta Swing Muzzle Brake is specifically designed for 9MM Pistols and Carbines.
The brake is CNC Machined from Solid Steel, treated and and then coated for durability and easy maintenance. It's threaded with a standard 1/2x28 pitch for most applications in this caliber.
The brake comes in a plastic bag, timing shims can be sourced from Brownells or any gunsmith supply source.