Abstract: A drywall texture gun, having a chamber spray head with a one-way check valve installed at a first end thereof to allow compressed air flowing therein, a nozzle connected to a second end of the chamber spray head, and a supply tube extending across the chamber spray head with an inlet entering a texture supply and an outlet entering the nozzle. The outlet is restricted in the nozzle with an adjustable space to reciprocate responsive to the compressed air. Further, the outlet is so structured that the compressed air is introduced from the chamber spray head to adjust a pattern of a texture flowing therethrough. The inlet is so structured that the compressed air is able to flow from the chamber spray head to the texture supply to drive the texture into the tube. In an alternate embodiment, a compressed air gun is joined to the chamber spray head and includes a trigger assembly. An air bleed mechanism responds to the trigger during shut off to bleed off existing gun pressure.