A hand-held paint spray gun apparatus having a paint reservoir on the gun and reciprocating piston driven by a motor in the hand-held paint spray gun, the gun having a multiple orifice spray tip with a pair of apertures emitting generally fan or cone shaped overlapping spray patterns. A locking nut retains the cylinder to a motor frame and a frame carries the spray tip, with one of the nut and frame having a corrugated surface and the other of the locking nut and the spray tip frame having a plurality of protrusions engaging the corrugated surface. The protrusions are spaced apart circumferentially from each other and with respect to the spacing of a plurality of troughs and crests in the corrugated surface such that only one protrusion at a time is nested in a trough of the corrugated surface.