JMac - MDi-co

4C 5/8-24 KeyMount

(1 Review)
Current Stock:
3.24 Ounces
Shim Kit
Pin for Pin/Weld


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

The RRD-4C is 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.

  • Thread Pitch: 5/8-24
  • Overall Length: 2.82"
  • Length Added: 2.1"
  • Material: 17-4ph Stainless
  • Weight: 3.28oz
  • *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 (1)

RRD-4c 30s Keymo

Written by Christian Mendoza on Aug 16th 2021

3 things that need to be addressed here and its absolutely amazing. 1. The fireballs. The amount of flash that comes from this comp is just way to awesome. Some people may not like it, but to me, its the true way an AK (in my case, a Galil Ace) should be. 2. Recoil Mitigation. The factory flash hider from my Galil Ace is no where near matched to this 30S. The recoil impulse on this gun with the comp is to die for. Its such a soft shooting pistol and i couldnt enjoy it anymore. Put 500 rounds through the Comp and let me tell you, every mag i finished made me want to shoot more. 3. Ease of Installation. It couldn't have been anymore easier to attach this comp to my Galil. only using a crescent wrench and a 3/4 wrench to have it all come together along with an alignment tool, is one of the easiest additions to you rifle you can add. Please do yourself a favor. Get this for your rifle. You will most certainly not regret it. Its a great addition, and couldn't be anymore happier with it. 6 out of 5 stars.

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