The ornamental design for an adjustable paintspraygun, as shown and described.
FIG. 1 is a right side elevational view of an adjustable paint spray gun
showing my new design, the left side being substantially similar in
appearance;
FIG. 2 is a bottom plan view thereof;
FIG. 3 is a top plan view thereof;
FIG. 4 is a rear end elevational view thereof; and