(R)ecoil (R)eduction (D)evice (4)ports (C)ompensator (1/2x28) thread pitch (F)acemount (KM) KeyMount

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

This RRD-4C is designed to be permanently attached to a 14.5 inch barrel and allows you to attach KeyMount compatible devices and suppressors! We recommend this muzzle device be professionally installed on our 14.5" barrel by one of our Kalashnismiths to ensure alignment.

• 1/2-28 threads
• 2.82" long
• Only adds 1.5"
• Sleeves the barrel 1.32"
• 17-4ph Stainless
• 3.6oz
• *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.

*This WILL NOT work on a standard 1/2-28 AR-15 barrel. Barrel must extend at least 1.32” from the gas block.

BARREL DIAMETER MUST BE <0.585"

This device is designed to be tightened against the face of the barrel. You must use our face shims (optional) or your barrel MUST be faced to properly time this muzzle device. If you're not familiar with Facemount devices, click HERE to learn more!

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.