Comstock Armory Compact Facemount Plan-B Muzzle Brake, 5/8x24, 9mm, Black Nitride

Comstock Armory Compact Facemount Plan-B Muzzle Brake, 5/8x24, 9mm, Black Nitride

The Comstock Armory MBC-58-9-FM is a compact facemount muzzle brake combining 5/8x24 barrel threads with a Plan-B suppressor-mount interface. Its 9mm configuration, 17-4 PH stainless steel construction and black nitride finish identify this exact version.

This specialized facemount design is intended for a barrel that lacks a suitable mounting shoulder. It seats against the muzzle face and is not intended for a conventional shouldered barrel such as a standard AR-15 barrel. Matching the thread pitch alone does not establish fit.

Shop the Comstock Armory MBC-58-9-FM at BattleHawk Armory for your compatible 5/8x24 setup.

Recoil Reduction and Blast-Baffle Protection

The brake geometry helps reduce recoil and provides a sacrificial surface ahead of a compatible suppressor's blast baffle. The steel body combines those functions with the mounting interface, making the device useful when recoil management and suppressor compatibility are both priorities.

The rotationally symmetric body does not require timing shims. Its black nitride treatment gives the stainless steel a durable, dark finish, while the wrench flats provide a dedicated tool interface.

Compatibility and Configuration

The suppressor-side interface fits compatible 0.900-24 Plan-B adapters, including Comstock LPA, Q Plan-B and Rearden Atlas. Barrel threading, bore clearance and the suppressor's internal space must all suit the intended configuration. The muzzle device does not establish the caliber rating of the suppressor.

The facemount body overlaps the barrel by 0.50 inch. Some barrel geometries can leave threads visible at its rear. The complete device is 1.6 inches long and weighs 1.8 ounces. Select this version specifically for its face-seating geometry.

Product Specifications

• Manufacturer: Comstock Armory
• Model / Manufacturer SKU: MBC-58-9-FM
• UPC: 850069580278
• Product type: Compact Facemount Muzzle Brake
• Material: 17-4 PH stainless steel
• Finish: Black nitride
• Weight: 1.8 oz
• Barrel threads: 5/8x24
• Mounting system: Plan-B pattern; complete-system fitment required
• Bore compatibility: Up to 9mm
• Overall length: 1.6 inches
• Mounting geometry: Facemount for barrels without a suitable shoulder; 0.50-inch barrel overlap

Frequently Asked Questions

Choose the Comstock Armory MBC-58-9-FM at BattleHawk Armory for a correctly matched compact facemount muzzle brake and Plan-B mounting interface.