The ornamental design for a rf scan gunholder, as shown and described.
FIG. 1 is a top plan view of the RF scan gun holder of the present design;
FIG. 2 is a first side elevational view thereof;
FIG. 3 is a second side elevational view thereof;
FIG. 4 is a bottom plan view thereof; and,
FIG. 5 is a perspective view thereof with a RF scan gun shown in broken
lines, the broken line drawing is for illustrative purposes only and forms
no part of the claimed design.