No, muzzle brakes don’t reduce noise.
They work by redirecting the gas that is expelled from the barrel of a gun upwards and sidewards from the shooter, which in turn reduces the felt recoil and muzzle rise. Muzzle brakes can be very effective in reducing recoil, but they also increase muzzle flash. They make the noise seem louder to the shooter, as high-speed propellant gas is directed sideways to minimize recoil.
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Anonymous edited answer September 22, 2022