CMMG Zeroed B Adapter RBB Brake Features The CMMG Zeroed B Adapter RBB Brake is machined specifically to the M12x1.0 left hand thread pitch found on the PS90 and P90 so it installs directly onto the factory barrel without an aftermarket thread adapter. That direct fit keeps the overall package simple and avoids the added length and weight of an intermediate mount. The brake s design works to redirect propellant gas away from the shooter s line of sight helping manage muzzle rise during rapid strings of fire. Because it mounts at the factory thread location the brake keeps the PS90 and P90 s compact bullpup profile intact rather than adding unnecessary length forward of the handguard. CMMG builds its muzzle devices to hold up to repeated firing cycles giving PS90 and P90 owners a durable option that will not loosen or degrade with regular range use. The left hand thread direction is specific to this platform so shooters should confirm their own barrel s thread before ordering a replacement device. This brake is a simple direct upgrade for anyone running a PS90 or P90 who wants improved muzzle control without altering the rest of the firearm. It is available now for sale at GrabAGun for shooters looking to round out their PS90 or P90 build. CMMG Zeroed B Adapter RBB Brake Specifications Manufacturer: CMMG Model: Zeroed B Adapter RBB Brake Type: Muzzle Brake Compatible Hosts: PS90 P90 Thread Pitch: M12x1.0 LH Available At: GrabAGun