Dead Air Armament Hub Fixed Mount Muzzle Device .3/4-20 Thread Black. These are HUB compatible (1 3/8-24) and available in a variety of thread pitches. This is what you need for your Nomad Primal and other HUB compatible silencers. Specifications for Dead Air Armament Hub Fixed Mount Muzzle Device: Manufacturer: Dead Air Silencers Fabric/Material: 4140 Alloy Steel Color: Black Finish: Matte Condition: New Gun Model: Universal Package Contents: Dead Air Armament Hub Fixed Mount Muzzle Device What firearm models does the manufacturer say Dead Air Armament Hub Fixed Mount Muzzle Device is compatible with? The manufacturer suggests that Dead Air Armament Hub Fixed Mount Muzzle Device is compatible with UniversalDead Air Armament Hub Fixed Mount - LT306