JMac - MDi-co

2C H&K 15x1 KeyMount (KeyMicro)

(1 Review)
$109.95 $87.96
You save $21.99
Current Stock:
3.46 Ounces
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Facemount Shims
Pin for Pin/Weld

(R)ecoil(R)eduction(D)evice(2) ports(C)ompensator(15)15-1 thread pitch(F)aceMount(KM)KeyMount

In order to use this device with a suppressor, it must be installed by a professional - to ensure it is properly mounted and aligned. Do NOT shoot without checking alignment with bore rods. JMac Customs is not responsible for any damage to the suppressor, or any injury resulting from improper installation. Some firearms are NOT suitable suppressor hosts, just because you can thread this muzzle device on, does NOT mean it is safe to use.

The RRD-2C is a shortened version of the RRD-4C by removing the 2 smallest ports creating a more compact package!


  • 15-1 Threads - Fits G36C, G36K, HK33, any 15-1 threads that are more than 0.9" from the gas block
  • Sleeves the barrel 0.9", adds 1.33"
  • KeyMo & KeyMicro Suppressor compatible
  • 10mm Bore
  • 2.23" Long
  • 17-4ph Stainless Steel
  • Black Nitride

Keymount & X-Series Suppressor Compatibility


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.


Reviews (1)


Written by Patrick on May 31st 2022

I have been looking for awhile for a good brake for my ptr rifle. I use JMAC products on almost all my rifles for muzzle devices. Previously I was running a thread adapter for 15x1 to 5/8x24 and then a rrd4c. I’m very happy to be able to lighten up the muzzle with this product. My particular barrel is an older hbar version so the device didn’t sleeve the barrel, but it did shoulder mount just fine. Overall great product!

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