There's a very early original "jaeger" style rifle, stocked in ash, very short barrel, looks first half of the 18th century, (I think it's in RCA volume 2) that has 2 brass plates in a slanted joint separating the 2-piece forestock. It's an odd gun but very interesting. I got to handle it when George was photographing it at a gun show in Pennsylvania around 1980. It looks like a colonial American restock of a European rifle. Maybe the original had the same slanted joint.
I looked it up and it's RCA #111