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MB556K Surefire MB556K Muzzle Brake for 5.56MM fits M4/M16 AR15 Variants

Manufacturer: Surefire
Manufacturer part number: MB556K
UPC: 084871310277
Out of stock - Currently No Backorders
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The MB556K muzzle brake fits the Colt Commando, M4, M16, HK 416, and other 5.56mm .223 cal. semi-auto, bolt-action, or assault rifles with Mil-Spec 1/2-28 muzzle threads.

The MB556K muzzle brake greatly reduces both recoil and up-and-right muzzle movement to keep you on target for faster follow-up shots, while their patented Impulse Diffusion design minimizes side blast and rear-directed concussion effects. To see one in action, click on the video button at left. Machined from heat-treated stainless steel, finished in tough corrosion-resistant SureCoat, all SureFire muzzle brakes are extremely resistant to gas and particle erosion and will perform perfectly for thousands of rounds.

The MB556K muzzle brake also serves as a precision, rock-solid adapter mount that enables rapid no-tools attachment of SureFire FA556K, FA556-212, FA556MG, MINI, or MICRO suppressors to the Colt Commando, M4, M16, HK 416 with 14.5" or longer barrel, and to other 5.56mm .223 cal. semi-auto, bolt-action or assault rifles with Mil-Spec 1/2-28 muzzle threads and due to slight suppressor overlap first .170" of barrel behind the threads clear of obstructions and no more than .800" in diameter.

NOTE: SureFire muzzle brakes and flash hiders also serve as adapter mounts for our Fast-Attach® sound suppressors. If you do not plan to attach a SureFire sound suppressor to your firearm, we recommend choosing a shorter-length muzzle brake or flash hider. SureFire muzzle brakes and flash hiders that mate with our overlap suppressor models are longer in order to extend rearward over the barrel, a feature that is unnecessary unless mounting an overlap suppressor.


  • Provides rock-solid suppressor attachment in seconds without tools Also serves as a precision adapter mount for SureFire FA556K and FA556-212, FA556MG, MINI, and MICRO suppressors
  • Machined from heat-treated stainless steel, finished in tough, corrosion-resistant Surecoat
  • High resistance to heat and gas/particle erosion
  • 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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