Comstock Armory Recessed Micro Plan-B Muzzle Brake, 1/2x28, 9mm, Black Nitride Recessed Micro Brake compatible with common .900-24 adapters like the Comstock LPA, Q Plan-B, and Rearden Atlas. The recessed micro brake greatly reduces recoil and blast baffle wear, and unlike most brakes out there, it does not need to be timed with shims. Its limited protrusion can help with recessed-adapter clearance. Confirm the exact muzzle-device and suppressor combination. Product Specifications Manufacturer: Comstock Armory Model / Manufacturer SKU: MBM-12-9-R UPC: 850069580391 Product type: Recessed Micro Muzzle Brake Material: 17-4 PH stainless steel Finish: Black nitride Weight: 1.4 oz Barrel threads: 1/2x28 Mounting system: Plan-B pattern; complete-system fitment required Bore compatibility: Up to 9mm Overall length: 1.25 inches Added length: 0.42 inches Maximum barrel diameter: 0.750 inches The recessed body requires a barrel diameter of 0.750 inch or less. Matching the thread pitch does not establish full clearance. Compatible with the SIG Taper Cap. Other taper-shoulder adapters with a larger outside diameter may not fit. Shop the Comstock Armory MBM-12-9-R at BattleHawk Armory for your compatible setup.