The ornamental design for a gunrest, as shown and described.
FIG. 1 is a perspective view of a gun rest showing our new design;
FIG. 2 is a front elevational view thereof;
FIG. 3 is a rear elevational view thereof;
FIG. 4 is a right side elevational view thereof;
FIG. 5 is a top plan view thereof; and,
FIG. 6 is a bottom plan view thereof.
The spaced dotted lines in the drawings depict stitching that forms no part of the claim.
The evenly spaced broken lines shown in the drawings represent portions of the gun rest and environmental subject matter that form no part of the claim.