Comstock Armory Compact Plan-B Muzzle Brake, 1/2x28, 9mm, Black Nitride Compact muzzle brake compatible with common .900-24 adapters like the Comstock LPA, Q Plan-B, and Rearden Atlas. The MBC greatly reduces recoil and blast baffle wear, and unlike most brakes out there, it does not need to be timed with shims. Product Specifications Manufacturer: Comstock Armory Model / Manufacturer SKU: MBC-12-9 UPC: 850069580117 Product type: Compact Muzzle Brake Material: 17-4 PH stainless steel Finish: Black nitride Weight: 1.8 oz Barrel threads: 1/2x28 Mounting system: Plan-B pattern; complete-system fitment required Bore compatibility: Up to 9mm Overall length: 1.6 inches Added length: 0.97 inches Shop the Comstock Armory MBC-12-9 at BattleHawk Armory for your compatible setup.