[maple_leaf_eh]

Where are you located? If the Canadian C1 is similar, there is a way of interesting ex-Canadian weapons technicians in your project. The Electrical Mechanical Engineer Association has a journal.

Make a good photo story, describe your gun, ask specific questions and ask for help. There will be people who will be jealous, people who will be dismissive, and others who are genuinely curious.

I don't know when 105s like yours left the US inventory.