This is a Rugged Suppressors Muzzle Brake, model MB010.
This muzzle device is designed for reducing recoil when shooting unsuppressed on 5.56 platforms. The 2 Port Brake utilizes our Dual Taper Locking System(TM)" making it compatible with our Radiant762" Surge 7.62" Razor 7.62 and Micro30.
Features:
30 Cal aperture
Dual taper locking system