Surefire SFMB-556 Muzzle Brake Adapter 5.56 1/2-28 Black

The Surefire SFMB-556 is a muzzle brake and SOCOM-series suppressor adapter engineered for 5.56/.223 platforms with 1/2-28 muzzle threads. Its Impulse Diffusion porting pattern is designed to reduce recoil impulse and muzzle rise for faster follow-up shot recovery while minimizing side blast and rear-directed concussion effects. Precision machined from U.S. mill-certified heat-treated stainless steel and finished with a DLC coating, the SFMB-556 also functions as a robust mounting adapter for Surefire SOCOM Fast-Attach suppressors. The design includes multiple bearing surfaces for repeatable suppressor alignment and pilot holes for optional tuning or pin-and-weld installation.

Key Specifications

• The caliber is .223 REM / 5.56 NATO.
• The thread pattern is 1/2-28 (1/2×28 tpi).
• The material is stainless steel.
• The finish is black DLC.
• The overall length is 2.7 inches.
• The design includes Impulse Diffusion offset porting to reduce recoil impulse and muzzle rise.
• Serves as a mounting adapter for Surefire SOCOM Series Fast-Attach suppressors.
• Includes multiple bearing surfaces to promote precise suppressor alignment.
• Pilot holes are provided for tuning or pin-and-weld installation.
• The NFA attachment method is quick detachable (Fast-Attach style).

Robustly built and purpose-designed, the SFMB-556 pairs precision machining with a durable DLC finish to deliver consistent alignment and service life when used with SOCOM-series Fast-Attach suppressors. It is a practical choice for shooters who require a proven adapter that combines recoil-mitigation features with reliable suppressor mounting and straightforward field tuning options.