A muzzle brake includes three primary structural components, namely a main body, a baffle, and an end cap. The components are preferably integrally fabricated into a single piece device, or alternatively may be fabricated separately and assembled. A muzzle brake in accordance with the present invention comprises a generally cylindrical muzzle brake assembly attachable to the muzzle end of a firearm. The muzzle brake assembly forms two expansion chambers, each of which is bounded by a peripheral sidewall defining opposing left and right vent apertures and a converging end wall. The end walls define axially aligned openings sized slightly larger than the diameter of the projectile for allowing the projectile to pass from the firearm muzzle, through the muzzle brake, and onward down the target line toward the intended target. The first chamber defines opposing left and right vent apertures for venting gases generally upward and rearward to reduce muzzle jump. The second chamber defines opposing left and right side apertures, with the left aperture being substantially larger than the right aperture for venting gases to counter torque related movement.