JMac Customs 4C Face KeyMount Muzzle Brake - 14-1LH

Manufactured by JMac Customs
Manufactured by JMac Customs
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The JMac Customs 360 Face KeyMount HD and KeyMicro Muzzle Brake represents an exceptional accessory tailored specifically for short-barreled firearms. Engineered with a Heavier Duty design, the RRD-360HD offers enhanced protection with three layers of defense for suppressors, making it an ideal choice for high-pressure rifle calibers. JMac Customs has expertly reduced weight and size by strategically adding material in key areas without compromising performance.

Users will benefit from the innovative features of this muzzle brake, including notable recoil reduction and wide compatibility with various suppressors. The device ensures a hassle-free installation, as it does not require timing or shims, allowing users to experience its advantages right out of the box. With 14x1LH barrel threads, a compact 2.050" length, and a 10mm bore, seamless integration with KeyMount and KeyMicro systems is guaranteed. The muzzle brake is crafted from robust 17-4ph Stainless steel and finished with a resilient Black Nitride coating, ensuring long-lasting and reliable performance across various shooting scenarios.

It is crucial to consider that the device is not suitable for barrels shorter than 10.5". Achieving proper timing requires users to tighten the device against the face of the barrel using JMac Customs' optional face shims or by seeking professional assistance to have the barrel expertly faced. Furthermore, JMac Customs strongly recommends the installation and alignment of all suppressor mounts by certified professionals to ensure the safety of suppressors and firearms, preventing potential damage.Introducing the JMac Customs 4C Face KeyMount Muzzle Brake - 14-1LH, the solution for short-barreled firearms! Designed specifically for high pressures and short barrels, this muzzle brake features a Heavier Duty design which adds additional material where it's needed, reducing excess pressures and gasses associated with rifle calibers. The result? The same amazing performance as our 360 devices, in a lighter and minimally added length form factor, now for short-barreled firearms!

This brake features 3 layers of protection for your suppressor, no timing or shims required, and compatibility with dozens of suppressors, giving you reduced recoil and an overall smooth shooting experience. Plus, it can even be permanently attached to a 14.5" barrel to achieve 16" OAL.

Made from 17-4ph Stainless with Black Nitride finish, this device features 14x1LH Barrel Threads, 2.050" length (adds approx 1.45"), and 10mm Bore. It is KeyMount and KeyMicro Compatible, but not intended for barrels shorter than 10.5". It is recommended that all suppressor mounts be installed and checked for alignment by a certified professional to avoid any physical harm or damage to your suppressor/firearm. Tightening against the face of the barrel using face shims or face-milling method is necessary for proper timing.

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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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