JMac Customs 360 Face KeyMount & KeyMicro Muzzle Brake -14-1LH

Manufactured by JMac Customs
SKU: RRD-360-14F-KM
MPN: RRD-360-14F-KM
Manufactured by JMac Customs
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Introducing the JMac Customs RRD-360HD, the perfect solution for short-barreled firearms facing excess pressures and gasses. Designed with reinforced material where it's needed and removed where it isn't, this Heavier Duty device achieves amazing performance without compromising on size or weight. The RRD-360HD ensures a reduced recoil, is compatible with many suppressors, and requires no timing or shims.

This device adds only 1.45" in length, is compatible with KeyMount and KeyMicro, and features 3 layers of protection for your suppressor. Made of 17-4ph Stainless and coated in Black Nitride, this muzzle device is designed for 14x1LH Barrel Threads and a 10mm Bore. Please note that this device is not intended for barrels shorter than 10.5".

Tightening against the face of the barrel, face shims (optional), or your barrel being faced is required for proper timing. Achieve the desired 16" OAL for a 14.5" barrel with the JMac Customs RRD-360HD. 


  • Perfect solution for short-barreled firearms with excess pressures and gasses
  • Reinforced material for durability without compromising size or weight
  • Achieves reduced recoil and compatibility with many suppressors
  • No timing or shims required for installation
  • Adds only 1.45" in length to the firearm
  • Compatible with KeyMount and KeyMicro systems
  • Features 3 layers of suppressor protection
  • Made of 17-4ph Stainless steel with Black Nitride coating
  • Designed for 14x1LH Barrel Threads and 10mm Bore
  • Not intended for barrels shorter than 10.5"
  • Proper timing requires tightening against the barrel or face shims (optional)
  • Allows for desired 16" OAL for a 14.5" barrel
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BrandJMac Customs
Caliber Gauge.30 Cal
MaterialSteel - 17-4 PH Stainless
Suppressor MountDeadAir KeyMo
Thread PatternM14 X 1 LH
TypeMuzzle Brake
California Prop 65 warning

 WARNING: This product can expose you to chemicals, which are known to the State of California to cause Cancer and Reproductive Harm. For more information go to

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