Abstract: An improved dispensing gun for receiving and positioning a pair of aerosol containers and mixing and discharging the contents of the containers. The gun includes a combination cover unit and trigger plate pivotally affixed to a portion of a frame unit. The cover unit and trigger plate being positioned between an open, can loading position, a normally closed position and a contents discharge position. The gun also has a trigger carried by a handle and pivotably mounted for engagement with the cover unit and trigger plate. A mixing unit is also provided by the gun which includes a main body unit, a dispensing nozzle connected to the main body unit and a pair of removably positioned inlet elbows connecting the main body unit with outlets of associated aerosal can valve units.