Cobalt Kinetics RCB-HX 5.56 Huxwrx QD Muzzle Brake - High Temp - 1/2X28

Manufactured by Cobalt Kinetics
SKU: CK-RCB-HX-17-4-556
MPN: CK-RCB-HX-17-4-556
Manufactured by Cobalt Kinetics
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The Cobalt Kinetics RCB-HX 5.56 Huxwrx QD Muzzle Brake addresses the challenge of excessive side blast and concussion from large port brakes. Its innovative port design effectively channels gasses to mitigate muzzle climb, shorten follow-up shot times, and suppress flash, all without compromising comfort or control.

Crafted from 4140 steel with a nitride coating for exceptional durability, the RCB-HX boasts a 2.32" length and weighs only 4.28 oz. It features a 1/2X28 thread pitch, ensuring compatibility with 5.56 NATO AR-15 platforms.


  • 1/2x28 threading for 5.56 NATO
  • 4140 steel construction, high temp finish
  • Compatible with suppressors using a HUXWRX QD adapter
  • RC Hardness: 32-34 RC
  • Length: 2.325”
  • Weight: 4.288 oz.

For added versatility, the RCB-HX can be pinned and welded to achieve a 16" overall barrel length on barrels between 14.5" and above, making it ideal for compliance-conscious users. Compatible with any suppressor utilizing a HUXWRX QD adapter, the RCB-HX offers a comprehensive solution for shooters seeking to minimize recoil and enhance their shooting experience.

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BrandCobalt Kinetics
Caliber Gauge5.56 NATO
MaterialSteel - 4140 Chrome Moly
Suppressor MountHUXWRX Torque Lock
Thread Pattern1/2 X 28
TypeMuzzle Brake
Weight4.28 oz.
California Prop 65 warning

 WARNING: This product can expose you to chemicals, which are known to the State of California to cause Cancer and Reproductive Harm. For more information go to

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