Comstock Armory Compact Plan-B Muzzle Brake, 5/8x24, .30 Cal, 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-58-30 UPC: 850069580124 Product type: Compact Muzzle Brake Material: 17-4 PH stainless steel Finish: Black nitride Weight: 1.7 oz Barrel threads: 5/8x24 Mounting system: Plan-B pattern; complete-system fitment required Bore compatibility: Up to .338 / 8.6mm, including .308 / 7.62mm Overall length: 1.6 inches Added length: 0.97 inches Shop the Comstock Armory MBC-58-30 at BattleHawk Armory for your compatible setup.