NEW Expo Arms KeyMo Muzzle Brake At Primary Arms


    Mounting options for silencers have grown in number over the past few years. With an endless number of thread pitches and directions, some have sought to improve upon the current system. One such company is Dead Air Silencers, who brought the KeyMo mounting system to market. Primary Arms and Expo Arms came together to provide a new muzzle device that works with this mounting system. This is the new Expo Arms KeyMo 1/2x28mm Muzzle Brake.

    Primary Arms news @ TFB:


    The Expo Arms KeyMo 1/2x28mm Muzzle Brake is a single-chamber muzzle brake with exceptional recoil mitigation and built-in compatibility with the KeyMo suppressor mounting system. When paired with a Dead Air Sandman suppressor, this brake acts as a sacrificial baffle, improving longevity and performance of the suppressor.

    The NEW Expo Arms KeyMo Muzzle Brake


    The Expo Arms KeyMo Muzzle Brake is available only through Primary Arms. It’s designed to work with the Dead Air Silencers KeyMo mounting system. This brake is 2.7″ in length which means that it can be pinned and welded to a 13.9″ barrel, while still reaching the 16″ barrel requirement for long guns. It’s made of 4140 steel and is finished in black nitride for added resistance to wear. Threads are 1/2x28mm. The bore is cut for .30 caliber projectiles, giving 5.56/.223 some extra room. This was done to reduce noise and concussion for you and those around you. That should be a non-issue once you pair it with a Dead Air KeyMo suppressor.



    • Overall length: 2.7″
    • Thread pitch: 1/2x28mm
    • Material: 4140 Chrome Moly
    • MSRP: $110.00


    Head over to Primary Arms if you’d like to add one of these to your newest build. If you’d like to be kept updated with everything new from Primary Arms, make sure to follow them on social media. You can find them on Facebook, Instagram, Twitter, and YouTube. Get out there and train!

    Nic L

    Stemming from his childhood love of WWII history, Nic’s passion for firearms continues to grow as his maturity level recedes. He has competed in local USPSA, IDPA, and rifle competitions, and has an almost unnatural affection for Rosie, his Gen3 Glock 19.