Griffin Armament DUAL-LOK EZ-Brake Muzzle Brake 9mm Black Nitride. (DUAL-LOK 5 DUAL-LOK 7 HRT-556 and HRT-762) Constructed of 17-4 PH stainless steel the DUAL-LOK EZ-Brake features 3 radial slots which provide effective recoil mitigation. The DUAL-LOK EZ-brake weighs 2.5 ounces making it one of the lightest mounts available for the DUAL-LOK Interface. The lighter weight reduces suppressor system weight while making the host firearm barrel lighter and more responsive to the shooter. The EZ-Brake does not require timing and will interface with a 13/16" standard socket wrench for installation. Specifications for Griffin Armament DUAL-LOK EZ-Brake Muzzle Brake: Manufacturer: Griffin Armament Color: Black Finish: Black Nitrid Fabric/Material: 17-4PH Stainless Steel Length: 1.4 in Weight: 2.5 oz Features of Griffin Armament DUAL-LOK EZ-Brake Muzzle Brake Radial slots provide recoil mitigation with no timing required Taper and DUAL-LOK retention ring ensures solid lock up and minimal/repeatable POI shift 17-4 PH Stainless steel Lustrous Black Nitride Finish Package Contents: Griffin Armament DUAL-LOK EZ-Brake Muzzle Brake GFNDLEZ9MM1228