Hello Tom. My survey spreadsheet now has info on just over 200 rifles (including yours) and from those that I know of, I can say there is at least 18 in the US. That figure is just under 9% of the survey responses, so I suppose it wouldn't be a stretch to say possibly as many as 9% of the total production? That would put the number at about 140.... Hmmmm... probably no way of ever knowing for sure.