The ornamental design for a surfacepattern of a firearm barrel, as shown and described.
The file of this patent contains at least one drawing/photograph executed in color. Copies of this patent with color drawing(s)/photograph(s) will be provided by the Office upon request and payment of the necessary fee.
The FIGURE is a side view of a surface pattern of a firearm barrel, showing our new design.
The present design is smooth to the touch and possesses no three-dimensional properties other than being applied to a round barrel of a firearm as shown in the drawings. The broken lines in the drawings depict the boundary of the claim and form no part of the claimed design.