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

SKU: 770-056

The advanced SureFire SFMB-556-1/2-28 muzzle brake, which fits M4 / M16 weapons and variants with 1/2-28 muzzle threads, greatly reduces both recoil impulse and muzzle rise so that the weapon tracks straight back to keep you on target for faster shot-to-shot recovery. Its patented Impulse Diffusion design minimizes side blast and rear-directed concussion effects. The SFMB-556-1/2-28 also serves as a rock-solid mounting adapter for SureFire SOCOM Series 5.56 mm Fast-Attach® suppressors, the SOCOM556-RC model having placed first in the most extensive and rigorous suppressor testing ever conducted by US Special Operations Command.

Precision machined from US mill-certified heat-treated stainless steel bar stock—including high-precision single-point cut threads for optimum thread interface—the SFMB-556-1/2-28 muzzle brake is given a black Ionbond DLC coating to provide maximum protection under harsh environmental conditions and to facilitate cleaning even after extreme use.

When used in conjunction with a SOCOM Series suppressor, the patent-pending design of the SFMB-556-1/2-28 provides multiple bearing surfaces to ensure superior suppressor alignment. A rear labyrinth seal minimizes potential carbon buildup in the indexing system and facilitates suppressor removal after extended firing.

All SureFire SOCOM Series muzzle brakes have blind pilot holes at the 3 and 9 o’clock position to enable fine-tuning of recoil characteristics for individual shooting styles or ammunition characteristics. They also have blind pilot holes at the 6 o’clock position to enable indexing the adapter at bottom dead center, and to pin-and-weld on short-barreled rifles. All that is required is a basic hand drill and appropriate drill bits.

SureFire muzzle brakes are individually inspected for concentricity and alignment, and each is covered by SureFire’s No-Hassle Guarantee.

FITS: M4, M16 and variants wih 1/2-28 muzzle threads

MOUNTS: All SureFire SOCOM Series 5.56mm/.223 caliber sound suppressors

NOTE: SureFire SOCOM Series Fast-Attach sound suppressors and current-model muzzle brake/suppressor adapters and flash hider/suppressor adapters are not compatible with previous SureFire Fast-Attach sound suppressors, muzzle brakes, or flash hiders.


  • Offset porting delivers greatly reduced recoil impulse and muzzle rise, so the weapon tracks straight back to keep you on target for faster shot-to-shot recovery
  • Multiple bearing surfaces for superior suppressor alignment
  • Precision machined from US mill-certified heat-treated stainless steel bar stock
  • High-precision single-point cut barrel threads for optimum thread interface
  • Inspected for all critical dimensions including concentricity and alignment
  • Pilot holes for tuning of muzzle brake and to pin-and-weld on short-barreled rifles
  • Black Ionbond DLC coating provides maximum protection against harsh environmental conditions and facilitates cleaning after extreme use
  • Serves as rock-solid mounting adapter for SureFire SOCOM Series sound suppressors
  • Labyrinth seals prevent carbon buildup on suppressor lock ring indexing system
  • Installation requires no permanent modifications for M4 / M16 / AR15 type weapons

  • 5656
    10 out of 11 people found this helpful.
    Reviewed by cv640 1 year ago
    I bought this for my 3 gun rifle. The transaction was as expected from LaRue, lightning fast and extra goodies included. The installation was straight forward until I tried to follow the directions. I watched the Surefire install video and got to work. The bushing got me close, but it needed a little too much torque. I went to the shim kit and referenced the booklet. That put the brake about 270 degrees off. I decided to take a file to the bushing until it lined up with no shims, hit it with the included Rocksett and called it good. The brake's performance is exactly what I hope it would be. On my 18" HBAR, the recoil is all but gone, no muzzle rise and it is very stable laterally even without tuning it. This is a far better muzzle device for 3 gun than the BCM comp it replaced. I am very happy with it and would buy again. Now to get that SOCOM suppressor...
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    0 out of 0 people found this helpful.
    Reviewed by Anonymous 35 weeks ago
    The surefire brake is he only comp that i will put on any of my rifles i have been running ARs for a long time now and there is no comp that even compares when it comes to being on target Plus all the cool stuff LaRue sends in the package just makes them the best they are committed to their customers and the constitution A+
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    0 out of 0 people found this helpful.
    Reviewed by Anonymous 38 weeks ago
    Great muzzle brake for use with the Surefire SOCOM series suppressors (obviously), but phenomenal at preventing muzzle rise without a can. Like all muzzle brakes, they are loud. This product is no different. Larue obviously takes their time to ensure they don't sell garbage products - even when made by another vendor. This product selection is no different. As ALWAYS, first rate customer service, super fast transaction, and lots of goodies to keep me surprised, and educational materials to share at the office (and put your stickers EVERYWHERE).
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    0 out of 0 people found this helpful.
    Reviewed by Anonymous 52 weeks ago
    Bought this muzzle brake with my 16" stealth upper. Came installed and the pin and weld job done by larue was top notch and matched the quality of the muzzle brake and upper. As far as funcionality goes the recoil management is excellent muzzle flash is very little and if ur standing to the side of the shooter hold on cause shes loud as hell.
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    0 out of 0 people found this helpful.
    Reviewed by Anonymous 1 year ago
    First off, have to say what a wonderful company La Rue is, very time I have order anything I have received a bundle of goodies and a few copies of the Constitution. The Surefire muzzle brake is the most effective device I have used for mitigating recoil, the concussive properties could be described as a strong distraction to fellow shooters. Great product better vendor.
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