Barrel

FIG. 1 is a perspective view of a barrel, showing the new design. FIG. 2 is a right side view thereof; FIG. 3 is a left side view thereof; FIG. 4 is a front side view thereof; FIG. 5 is a back side view thereof; FIG. 6 is a top view thereof; FIG. 7 is a bottom view thereof; FIG. 8 is a perspective view of a barrel, shown in an alternate configuration; FIG. 9 is a left side view thereof; FIG. 10 is a right side view thereof; FIG. 11 is a front side view thereof; FIG. 12 is a back side view thereof; FIG. 13 is a top view thereof; and, FIG. 14 is a bottom view thereof. The broken lines in the drawings illustrate portions of the barrel that form no part of the claimed design.