JMac - MDi-co

2C 1/2-28 KeyMount (KeyMicro)

(4 Reviews)
Current Stock:
3.46 Ounces
Shim Kit
Pin for Pin/Weld

(R)ecoil (R)eduction (D)evice (2) ports (C)ompensator (28)1/2x28 (S)houlderMount (KM)KeyMount

The RRD-2C is a shortened version of our popular RRD-4C muzzle brake. The RRD-2C was created by removing the 2 smallest ports from the RRD-4C, creating a more compact package while still maintaining the ability to mitigate recoil. 

*Can be permanently attached to a 14.5" barrel to achieve 16" OAL.

Product Specs:

  • 1/2-28 Threads
  • KeyMo & KeyMicro Suppressor compatible
  • 10mm Bore
  • 2.23" Long
  • Added length: 1.53"
  • 17-4ph Stainless Steel
  • Black Nitride
  • *Not intended or recommend for barrels shorter than 10.5” (see below) 

*When testing these devices, we found that high rates of fire such as full auto or “mag dumps” could cause damage to the device due to the excess heat, pressure, and gasses from unburnt powder on shorter barrels.

Keymount 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.***

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.

This is a licensed product through Dead Air Silencers. 

Reviews (4)

JMAC MuZzle deVice

Written by Ben on Apr 1st 2022

Haven’t shot with it yet but the build and finish looks nice. Wayyy better than the standard A2 my Galil came with


Written by Tyler Morrison on Nov 27th 2021


Best brake for my setup

Written by Michael T Cook on Jan 5th 2021

Amazing brake for my CZ Scorpion, works great with my Dead Air Wolfman suppressor. Highly recommend this.

Best comp/suppressor Muzzle device

Written by Tyler Frogley on Jun 2nd 2020

I run this brake on both a 7.62x39 hybrid AR and my 556. By far the best dead air brake out there. The flash hider dead air has just doesn’t do enough for me. This brake basically makes tuning negligible because it makes it so flat shooting already.

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