Comstock Armory 1/2×28 9mm Muzzle Brake

Description Comstock Armory 1/2×28 9mm Muzzle Brake The Comstock Armory 1/2×28 compact muzzle brake is the piece that ties a suppressor-ready 9mm or 5.56 build together without adding unnecessary bulk or requiring a timing ritual every time you thread it on. Comstock Armory machines the MBC-12-9 from 17-4 PH stainless steel and finishes it in black nitride — the same material and finish combination used in high-demand precision components because it holds up. At 1.8 ounces and just 1.6 inches overall, it adds only 0.97 inches to the muzzle, which means your suppressor-equipped setup stays compact. Because of its rotationally symmetric port design, the MBC installs flush and square without shims, alignment tools, or a timing wrench — just thread it on, torque it to spec, and run it. Beyond recoil reduction, the MBC-12-9 serves as a dedicated suppressor mount and a sacrificial baffle. The .900″-24 interface is compatible with the Q Plan-B, Rearden Atlas, and Comstock’s own LPA suppressor adapter, so quick-detach suppressor use is built in from the start. Furthermore, the brake’s position at the muzzle intercepts propellant gas before it reaches the first suppressor baffle, protecting your can’s internals from accelerated wear over round count. Key Features — Comstock Armory 1/2×28 Compact Muzzle Brake 17-4 PH stainless steel construction with black nitride finish 1/2-28 thread pitch; fits 9mm and 5.56/.223 barrels Compatible with .900″-24 suppressor adapters: Q Plan-B, Rearden Atlas, Comstock LPA Acts as sacrificial baffle — protects suppressor internals from blast wear Rotationally symmetric design — no timing, no shims required 3/4″ wrench flats for easy installation and removal 1.6″ overall length; adds only 0.97″ to the muzzle 1.8 ounces Why This Product Stands Out Most muzzle brakes ask you to make a trade-off: you get recoil reduction or suppressor compatibility, but not both in the same short package. The MBC-12-9 is specifically designed around the Plan-B mounting system, which means suppressor duty is not an afterthought — it is the primary purpose, with recoil reduction working in parallel. That integration also matters for suppressor longevity; because the MBC sits directly at the muzzle, it intercepts the initial blast and acts as the first sacrificial baffle, extending service intervals on the suppressor baffles behind it. The no-timing design deserves specific attention. On a standard muzzle brake with top ports, correct orientation matters — and achieving it with shims is tedious, time-consuming, and easy to get wrong. Comstock’s symmetric port layout eliminates that entirely. As a result, the MBC goes on clean every time regardless of where it stops on the threads, which means less setup time and one fewer thing to troubleshoot if something feels off. Additionally, the material and finish choices here are not spec-sheet filler. 17-4 PH stainless is a precipitation-hardened alloy used in aerospace and precision tooling because it combines high tensile strength with corrosion resistance at low weight. The black nitride surface treatment adds hardness and slickness at the surface without building up material or changing dimensions. For a component that lives at the muzzle of a suppressed host — where heat, gas, and carbon are constant — those properties matter in practice. Ideal Use Cases Suppressor-ready 9mm pistol-caliber carbines (PCC) and AR-9 builds Threaded-barrel 9mm pistols paired with a Plan-B or Rearden suppressor mount 5.56/.223 AR builds running Q Plan-B or compatible quick-detach suppressor systems Builders prioritizing minimal muzzle length on suppressed configurations Shooters wanting recoil reduction without committing to a suppressor full-time Technical Specifications Specification Details Manufacturer Comstock Armory Model MBC-12-9 SKU MBC-12-9 UPC 850069580117 Type Compact Muzzle Brake / Suppressor Mount Thread Pitch 1/2-28 Compatible Calibers 5.56/.223, 9mm (max bullet diameter 9mm) Suppressor Mount Interface .900″-24 (Plan-B / Rearden compatible) Material 17-4 PH Stainless Steel Finish Black Nitride Overall Length 1.6″ Muzzle Protrusion Adds 0.97″ Weight 1.8 oz Wrench Size 3/4″ Timing Required No — rotationally symmetric Compatibility Information Suppressor Adapter Compatibility The MBC-12-9 is compatible with .900″-24 suppressor adapters. Verified compatible systems include the Q Plan-B, Rearden Atlas, and Comstock Armory LPA. These adapters allow quick-detach suppressor use directly from this brake. Host Firearm Compatibility Any 9mm or 5.56/.223 firearm with 1/2-28 threaded muzzle. Common platforms include AR-9 pistol-caliber carbines, Glock-pattern and Sig-pattern threaded-barrel pistols, and 5.56/.223 AR-15 pattern rifles with 1/2-28 threads. Always verify bullet stabilization before attaching a suppressor, and use an alignment rod to confirm proper suppressor alignment. Note: some suppressor manufacturers do not warranty their products when used with aftermarket mounts or muzzle devices — check your suppressor’s warranty terms before installation. Manufacturer: Comstock Armory | Model: MBC-12-9 | Type: Compact Muzzle Brake / Suppressor Mount | Thread: 1/2-28 | UPC: 850069580117 | SKU: MBC-12-9