Brake does redirect the sound back towards the shooter. However, the full noise signature still happens at the muzzle, just like a non-braked gun. Unless you are more than a mile away down range, the relative noise factor isn't going to change significantly, unlike what a suppressor accomplishes. Think of it in terms of the difference in sound you hear when a gun is fired quite a distance from you, away from you versus more in your direction when you are out hunting. Same relative difference.
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