The ornamental design for a spraygun, as shown and described.
FIG. 1 is a perspective view of a spray gun showing our new design;
FIG. 2 is a front view thereof;
FIG. 3 is a rear view thereof;
FIG. 4 is a left side view thereof;
FIG. 5 is a right side view thereof;
FIG. 6 is a top view thereof; and,
FIG. 7 is a bottom view thereof.
The dash lines in the drawings represent the portions of the spray gun that form no part of the claimed design. The dot-dash lines in FIG. 7 represent the bounds of the claim and form no part thereof.