I claim the ornamental design of a reflector sight mount for a handgun, as shown and described.
FIG. 1 is a top front perspective view of a reflector sight mount for a handgun showing my design;
FIG. 2 is a bottom perspective side view thereof;
FIG. 3 is a front side view thereof;
FIG. 4 is a rear view thereof;
FIG. 5 is a left side view thereof;
FIG. 6 is a right side view thereof;
FIG. 7 is a top view thereof; and,
FIG. 8 is a bottom view thereof.
The broken lines shown inside the circular apertures in FIGS. 1 and 7 depict boundaries of the claim and form no part of the claimed design. All other broken lines in the drawings depict parts of the reflector sight for handgun that form no part of the claimed design.