Abstract: According to the invention a silencer for a firearm is arranged so that emitted gas, caught from the muzzle of the firearm after a shot, can both be caught and flow rearwards in the silencer after having been caught. This is accomplished in the way that the silencer comprises several separate chambers (1-5) extending longitudinally in the silencer. When the silencer is fitted to the firearm, there will be at least one chamber (1, 2) on either side of the muzzle of the weapon. The emitted gas is caught by holes (6) formed in a boundary surface between the chambers (1, 3, 4) in front of the muzzle and a central bore (16) through the silencer. The holes (6) extend radially through this boundary surface towards the bore (16) and are placed in rows which are spaced so that the holes (6) of each row will merge on the inside of the boundary surface towards the bore (16).