Abstract: A muzzle brake/compensator for attachment to the barrel of a firearm incorporates an expansion chamber for receiving expanding gases following a projectile exiting from the barrel of the firearm. The expanding gases in the expansion chamber are directed to strategically positioned ports in the periphery of the muzzle brake which directs the escaping expanding gases radially outwardly from the centerline of the firearm bore and inclined toward the firearm/shooter. The expansion chamber is provided with a baffle surface extending from the interior surface of a bore extension or wiper section to the port entrances of the respective ports. The angle of the baffle surface with respect to the bore centerline is limited to a range within which significant reduction in recoil force is achieved.