We claim the ornamental design for a firearm muzzle brake, substantially as shown and described.
FIG. 1 is a perspective view of the firearm muzzle brake in accordance with the present design.
FIG. 2 is an end-on elevation view of the distal end of the firearm muzzle brake of FIG. 1, the distal end being the end furthest from the barrel of a firearm when the firearm muzzle brake is operatively mounted thereon.
FIG. 3 is a left side view of the firearm muzzle brake of FIG. 1, showing its distal end on the left and its proximal end on the right, it being understood that the opposite right side view (not shown) is a substantial mirror image of the left side view as shown.
FIG. 4 is an end-on elevation view of the proximal end of the firearm muzzle brake of FIG. 1, the proximal end being the end closest to the barrel of a firearm when the firearm muzzle brake is operatively mounted thereon; and,
FIG. 5 is a left side view of the firearm muzzle brake of FIG. 1, showing its distal end on the left side and its proximal end on the right side, it being understood that the opposite right side view (not shown) is a substantial mirror image of the left side view as shown.