SWAT teams sometimes use silencers, not for stealth, but to insure that they will be able to hear if one of the SWAT team membersfires a shot inside the confined space of a room.
The tube silencers 23 have open end portions arranged to face the fan and the silencers of the first set 18 are spaced from the silencers of the second set 24 in both axial and radial directions.
