The Regulator is a tool-less adjustable port muzzle brake adaptable to any situation allowing shooters to manage muzzle blast and recoil. Specifications for Matador Arms The Regulator Muzzle Brake: Manufacturer: Matador Arms Color: Black Finish: Nitride Fabric/Material: 4140 Steel Model Generation: 1 Inner Diameter: 1.08 in Outer Diameter: 1.08 in Length: 3.6 in Weight: 6.8 oz Condition: New Features of Matador Arms The Regulator Muzzle Brake Allows shooter to manage muzzle blast and recoil reduction to suit their needs; 60+ engaged settings from full shutoff (0%) to fully open (100%); No tools for adjustment; simply adjust by clicking the locknut; Triple chamber, high efficiency muzzle climb; Extremely fast follow-up shots; When closed, gas is forced forward, away from the shooter Package Contents: Matador Arms The Regulator Muzzle Brake