From your description, and contrary to the first two responses, what you are asking about the
center pin,
the end of which protrudes from the extractor and engages the hole in the center of the breech face. It will be the same as a center pin from a Military & Police from the same period. Numrich, aka Gun Parts Company should be a good source as they include a description of the specific model the part fits. Failing Numrich I would try Jack First in Rapid City, SD,
(605) 343-9544 They have no on-line catalog and you will need to call them. The woman who will answer knowledgeable. All you will probably need to tell her is you need Victory Model
center pin.
I have no idea where the others came up with the answers they did! They have the small pin used to secure the front sight blades on some models, and the
locking bolt, which is located in the lug under the barrel and engages the front of the extractor rod!