The ornamental design for a railfingerstop with thick base, as shown and described.
FIG. 1 is a left, rear, bottom perspective view of a rail finger stop with thick base attached to a firearm showing our new design;
FIG. 2 is a left, rear, bottom perspective view of the rail finger stop with thick base of FIG. 1 with the firearm omitted;
FIG. 3 is a right, front, top perspective view of the rail finger stop with thick base of FIG. 1 with the firearm omitted;
FIG. 4 is a front elevation view of the rail finger stop with thick base of FIG. 1;
FIG. 5 is a rear elevation view of the rail finger stop with thick base of FIG. 1;
FIG. 6 is a bottom plan view of the rail finger stop with thick base of FIG. 1;
FIG. 7 is a top plan view of the rail finger stop with thick base of FIG. 1;
FIG. 8 is a right side elevation view of the rail finger stop with thick base of FIG. 1; and,
FIG. 9 is a left side elevation view of the rail finger stop with thick base of FIG. 1.
The broken lines showing portions of the design in all figures is included for the purpose of illustrating environment and unclaimed features and forms not part of the claimed design.