![]() Often there are two or three massive gas ports on each side, and several smaller gas holes on the top. The most sophisticated, aggressive muzzle brakes generally incorporate both expansion chambers and gas ports, and sometimes very large, rearward-angled gas ports into their design. Blowing forward around the sides of the bullet and following it, the gases hit baffle after baffle and jet hole after jet hole, expanding into the expansion chambers and being redirected out the sides of the brake. Hot gases boil into the muzzle brake the instant the bullet's base exits the barrel, expanding violently and traveling at several times the speed of the projectile itself. It must be oversized to allow the bullet free passage - if the bullet touches the inside of the brake with even the pressure of a whisker, it will be thrown off and become inaccurate. These gases provide jet-like force immediately before, during and after the projectile actually exits the barrel, resulting in effective muzzle redirection.Ī close look at the brake/barrel interface and the brake's internal guts reveal that as a bullet exits the rifled portion and crown - the last point the projectile touches as it heads downrange - it enters a slightly oversized tunnel through the brake. Baffles inside the brake create an expansion chamber, and holes drilled into that expansion chamber bleed gas off at various angles to the axis of the barrel. Like the rocket drawings you saw on 7-Eleven comic book racks back in the day, muzzle brakes - also known as compensators - harness exploding gunpowder gases and "ejecta" - particles, burning and otherwise - and redirect them in order to change the acceleration, or movement, of the rifle.
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