FIG. 1 is a perspective view from above, rear, and right side of a firearm receiver cover incorporating my new design;
FIG. 2 is a rear elevation view thereof;
FIG. 3 is a front elevation view thereof;
FIG. 4 is a right side elevation view thereof;
FIG. 5 is a left side elevation view thereof;
FIG. 6 is a top plan view thereof; and,
FIG. 7 is a bottom plan view thereof.
The uniformly broken lines shown in the figures represent portions of the firearm receiver cover that form no part of the claimed design. The dot-dashed broken lines shown immediately adjacent the shaded areas represent imaginary boundary lines to the claimed design and form no part of the claimed design.