A muzzle brake of a weapon or a weapons system for small- and medium-calibre weapons, that has a reduced outer signature with respect to heat and/or propellant gas emissions is provided. For this purpose, the propellant gas emerging from the barrel is diverted to the gas outlet openings of the muzzle brake in order to impinge on them to absorb the recoil, and is then made to pass further to the rear, and thereby cooled in a device.