In stock
JMac Customs RRD-4C KeyMount Muzzle Device w/ 1/2-28 Threads - RRD-4C-28F-KM
In stock

JMac Customs RRD-4C KeyMount Muzzle Device w/ 1/2-28 Threads - RRD-4C-28F-KM

SKU 51655109039
Model Number RRD-4C-28F-KM
Brand JMac Customs
Caliber 9mm
Customers must read Compliance Information before purchasing.

Product Details


Make: JMac Customs
Model: RRD-4C 28F KeyMount
Threads: 1/2-28


(R)ecoil (R)eduction (D)evice (4) ports (C)ompensator (1/2x28) thread pitch (F)ace - sits on the face of the barrel (KM) KeyMount

This is designed to be permanently attached to a 14.5 inch barrel and adapt to KeyMo compatilble suppressors! We recommend this muzzle device be professionally installed on our 14.5" barrel by one of our Kalashnismiths to ensure alignment.


This WILL NOT work on a standard AKM, pistol, or SBR. Barrel must extend at least 1.32” from the gasblock


  • 1/2-28 threads
  • 2.82" long
  • Only adds 1.5"
  • Sleeves the barrel 1.32"
  • 17-4ph Stainless
  • 3.6oz
  • This device is designed to be tightened against the face of the barrel. Your barrel MUST be faced to properly time this muzzle device.


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Shipping Restrictions

It is the customer’s responsibility for understanding state laws regarding all purchases made. For a comprehensive list of all Shipping Restrictions, please refer to our Shipping Restrictions By State Page found Here.

All NFA Rules Apply

These items are controlled by the U.S. Government and authorized for export only to the country of ultimate destination for use by the ultimate consignee or end-user(s) herein identified. They may not be resold, transferred, or otherwise disposed of, to any other country or to any person other than the authorized ultimate consignee or end-user(s), either in their original form or after being incorporated into other items, without first obtaining approval from the U.S. government or as otherwise authorized by U.S. law and regulations.