UPDATE:

Well, the fellow that I bought the Victory from just mailed me the Picatinny rail that can be substituted for the rear sight rail assembly. He also included the rear sight elevation screw tool. The tool is shaped like a standard allen wrench but instead of hex head it has a Torx bit on both ends. It matches a size 10 Torx. The screw that holds the rear sight rail assembly on is also using the same size 10 Torx screw. But, so as to muddy the waters, the windage screw is a slotted one.

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John