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Muzzle Brake / Suppressor Adapter

SFMB-556-1/2-28 muzzle brake / suppressor adapter

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Caliber 5.56 mm (.223 caliber)
Length 2.70 inches


SFMB-556-1/2-28 084871319256
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


    ITAR Notice
    Export of the commodities described herein is strictly prohibited without a valid export license issued by the U.S. Department of State, Office of Defense Trade Controls, prescribed in the International Traffic in Arms Regulation (ITAR), Title 22, Code of Federal Regulations, Parts 120-130.

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Parts and Accessories

Something not right

This was the brake I was told by Surefire fit my gun and suppressor. Brake installed well on my SIG. Suppressor mounted tight. First shot blew the suppressor off the end off my gun. Suppressor had a bullet hole at 4 o'clock position a muzzle of suppressor. Between brake and suppressor $1,800,00 down the tube.

Reviewed by Fred (Posted on 1/23/15)

Have them on 2 rifle's

Wow ! Cant say enough about these Brakes/Adapters ! You will notice a difference on your first shot ! Very nice ! Wish I could put one on my 300 WM . Cant , not enough meat on my barrel to accommodate the 5/8 thread

Reviewed by Redonkulus (Posted on 11/30/14)

Great product

Got this for my personal AR build. Night and day difference between the Surefire and the standard Colt Muzzle Break.
Follow up shots are very quick and tight. I would recommend this muzzle break to anyone.

Reviewed by Jeff (Posted on 11/13/14)


Took a long time to get it because it was sold out/out of stock....but after shooting the new brake, I see why.....keep em on the shelf and you'll make more money!

Reviewed by MILVET (Posted on 11/11/14)

Quality product from a quality company

I bought this muzzle brake for an ar15 I built. Have only shot about two mags with it but I gotta say so far I love it. I plan to do more extensive shooting from various positions to see how it really helps. I also bought this muzzle break to test on my ar15 because I buy another for my armalite ar10 supersass. Needless to say I will be ordering another. Love it!

Reviewed by Jeremy benson (Posted on 9/9/14)

Precision made, outstanding performance

I use my Surefire 556 suppressor on several rifles from 17 HMR to .223//5.56 All the mounts/adapters have been flawless with the QD system. Best of all, the performance of the suppressor is every bit as good as the fit of the mounts. I recommend them highly.

Reviewed by Wes (Posted on 8/13/14)


I bought this after a good bit of research on other brands. First, a cinch to install. Timing wheel explained everything perfectly. Second, the changed recoil effect has me keeping my LMT 5.56 spot on. Lastly what sold me was the trust I have in the SureFire brand. Nothing tops it in my book.

Reviewed by Jason (Posted on 8/8/14)

Great muzzle brake

I bought this muzzle brake to fit my colt m4, so I could use my socom 7.62 can on it. Works like a charm. Everything I've bought from surefire has been of the upmost quality. I wish the suppressors didn't have to be used on a proprietary muzzle brake or flash hider cause when setting up multiple rifles it can get expensive. But you won't be disappointed with finished product.

Reviewed by Louis (Posted on 6/24/14)


Wanted one for a while for 3 gun but didn't wanna buy it because the website said it works till a guy had one in my squad and lent me his rifle to my pleasure sprayed 20 and was amazed how i could keep on target with very minimal recoil shift. Not to hard to install; gonna take a few trys if you don't read the directions but all in all soon to be fitted with a socom suppressor 5 out of 5 for the brake.

Reviewed by daniel w (Posted on 5/12/14)