JMac - MDi-co

RRD-4C 28S KeyMount

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Current Stock:
3.88 Ounces
Shim Kit
Pin for Pin/Weld




(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
  • 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. 

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