There is a misunderstanding about muzzle brakes and loudness. Muzzle brakes most definitely make the rifle louder from the perspective of anyone behind the rifle. This is most easily demonstrated using a brake with a very aggressive gas angle. Brakes in the 40% and up recoil reduction range make this trait quite obvious to the observer. A brake is not sending gas out to the side of the barrel at a 90% angle. The brake is sending the gas backward.
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