Abstract: A portable gun for discharging highly pressurized fluid material such as tear gas or capsicum spray comprises an elongate refillable pressure vessel (8) for storing under pressure fluid material to be discharged. A discharge barrel (4) is coupled to the pressure vessel via a valve assembly (6) and through which the material is discharged when the valve assembly is opened by actuation of a trigger (38). The axis of the barrel is orientated in the same direction as the axis of the pressure vessel, and the gun is supported from the body of a user by a sling so that the gun can be supported with the axes of the pressure vessel and barrel generally horizontally directed.