JMAC: 4C 1/2-28 KeyMount

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(4) ports


(28) 1/2x28 threads


(KM) KeyMount

The best of both worlds! Our super effective RRD4-4C muzzle brake comp with KEYMO suppressor mount! 

These are designed to install with a shim kit on standard shoulder mount style barrels (factory muzzle device installed with crush washer) and can be permanently attached using the (optional) pin.

  • Threads: 1/2-28 threads
  • Length: 2.82" long 
  • Only adds 1.5"
  • Material: 17-4ph Stainless
  • Weight: 3.84oz

Keymount & X-Series Suppressor Compatibility

***JMac Customs is NOT responsible for improper installation of this muzzle device or any damage to the suppressor using this device. We recommend this be professionally installed and checked to ensure alignment.***

This is a licensed product through Dead Air Silencers. 


JMac Customs recommends that all suppressor mounts be installed and checked for alignment by a certified professional. Serious damage could result to your suppressor/firearm and physical harm is possible if installed/used incorrectly. All suppressor mounts MUST be tight against the shoulder or face of the barrel, using shims or face-milling method. Contact us if you have any questions or need a recommendation for professional installation. JMac Customs LLC is not liable for injury, damage, or death related to the usage of this product.