The ornamental design for a riflebipod, as shown and described.
FIG. 1 is a top perspective view seen from top and front of a rifle bipod showing my new design;
FIG. 2 is a front elevational view thereof;
FIG. 3 is a back elevational view thereof;
FIG. 4 is a left-side elevational view thereof;
FIG. 5 is a right-side elevational view thereof;
FIG. 6 is a top plan view thereof;
FIG. 7 is a bottom plan view thereof; and,
FIG. 8 is a top perspective view seen from top and front of a rifle bipod with a rifle interface which is configured for interfacing with a rifle thereof.
The broken lines in the drawings depict part of the rifle bipod that form no part of the claimed design.