Abstract: The present invention is directed to a nail gun outrigger for stabilizing the roll, pitch, and yaw of a nail gun. The outrigger is connected to the distal end of the magazine away from the driving head. For the preferred embodiment, the outrigger includes one or more outriggers that extend perpendicular to the axis of the magazine with feet contacting the nailing surface to control the pitch, roll, and yaw of the nail gun position to obtain consistent perpendicular installation of elastomer sealing pneumatic nails into preformed roofing panels installed on a wooden frame or substrate.