(R)ecoil (R)eduction (D)evice (4)ports (C)ompensator (28) 1/2x28 threads (S)houlder (KM) KeyMount

The best of both worlds! Our super effective RRD4-4C muzzle brake comp with KEYMO suppressor mount! 

The RRD-4C is designed to install with a shim kit on standard shoulder mount style barrels (factory muzzle device installed with crush washer) and can be permanently attached using the (optional) pin.

Product Specs:

• Threads: 1/2-28 threads
• Length: 2.82"  
• Adds 2.1"
• Material: 17-4ph Stainless
• Weight: 3.84oz
• *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.

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.