While muzzle brakes make guns louder and sometimes increase muzzle flash, they serve the legitimate purpose of mitigating or redirecting recoil by helping to manage the escaping gases at the muzzle end. This video shows exactly how those forces work, and illustrate the difference between a rifle fired with and without a muzzle brake in slow motion. Brakes can be integrated to a barrel or threaded on. These days, many rifles come with a brake, flash hider, or compensator.
Gun Science: How Muzzle Brakes Work
They help ease recoil, but how? Check out this gun science explanation with slow-mo video to back it up.