The ornamental design for a rearfoldingsight for a firearm, as shown and described.
FIG. 1 is a top, right, rear perspective view of a rear folding sight for a firearm attached to a firearm showing our new design;
FIG. 2 is a top, right, front perspective view of the rear folding sight of FIG. 1;
FIG. 3 is a front elevation view of the rear folding sight of FIG. 1;
FIG. 4 is a rear elevation view of the rear folding sight of FIG. 1;
FIG. 5 is a right side elevation view of the rear folding sight of FIG. 1;
FIG. 6 is a left side elevation view of the rear folding sight of FIG. 1;
FIG. 7 is a top plan view of the rear folding sight of FIG. 1;
FIG. 8 is a bottom plan view of the rear folding sight of FIG. 1; and,
FIG. 9 is a top, right, front perspective view of the folding sight of FIG. 1 showing the rear folding sight pivoted to an upright operative position.
The broken lines showing portions of the design in all figures are included for the purpose of illustrating environment and unclaimed features and forms not part of the claimed design.