A hand-held paint spray gun apparatus (30) having a paint reservoir (32) on the gun (40) and reciprocating piston (82, 82') driven by a motor (76, 76' ) in the hand-held paint spray gun (30, 30'), the gun (30, 30') having a multiple orifice spray tip (52, 152, 134) with a pair of apertures (92) emitting generally fan or cone shaped overlapping spray patterns. A locking nut (130) retains the cylinder (60, 60') to a motor frame and a frame (144) carries the spray tip (52, 152, 134), with one of the nut (130) and frame (144) having a corrugated surface (186) and the other of the locking nut (130) and the spray tip frame (144) having a plurality of protrusions (190, 192, 194) engaging the corrugated surface (186). The protrusions (190, 192, 194) are spaced apart circumferentially from each other and with respect to the spacing of a plurality of troughs (196) and crests (197) in the corrugated surface (186) such that only one protrusion (190,192,194) at a time is nested in a trough of the corrugated surface (186).
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