Tapco 2-Port Micro Muzzle Brake Black. Designed to be an easy add-on to any threaded pistol still making it concealable and increasing muzzle control and reduce recoil. Specifications for Tapco 2-Port Micro Muzzle Brake: Manufacturer: Tapco Color: Black Caliber: 9mm Luger Finish: Nitride Threads per Inch: 1/2x28 Length: 3.9 in Weight: 0.05 lb Tapco TAP22006 2-Port Micro Brake Black Nitride 1/2"x28 Threads 9mm Tapco TAP22006: 2-Port Micro Muzzle Brake Black