Dave, it looks like the pin that pushes the trip (the L shaped piece) up to lock the bolt open and hold the top lever to the right when you open up the action. There should be a spring that slides over the narrow end. The spring end then goes into the hole in the bottom of the trip, the pin end fits in the little indent in the cocking slide. Either that or it is the cocking hook pin, minus the spring, that pushes the hook on the barrels out.
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