We claim the ornamental design for a front grill for a model vehicle, as shown and described.
FIG. 1 is a top, front and left side perspective view of a front grill for a model vehicle showing our new design;
FIG. 2 is a front elevation view thereof;
FIG. 3 is a rear elevation view thereof;
FIG. 4 is a left side view thereof;
FIG. 5 is a right side view thereof;
FIG. 6 is a top plan view thereof;
FIG. 7 is a bottom plan view thereof; and,
FIG. 8 is a top, rear and right side perspective view thereof.
In the drawings, the broken line showing of features of the front grill for a model vehicle illustrate portions of the front grill for a model vehicle that form no part of the claimed design.