I agree with Dennis, I have seen a lot of really "artsy" innovations, on replica southern mountain rifles, that are claimed to be authentic features. Very few of them can be verified. When the muzzleloading community discovered the southern style rifles, a lot of builders took the bit in their teeth, and added primitive innovations that just weren't represented in the existing guns. So, its real easy to get off the reservation with this. Be careful, unless you are building a fantasy gun.
Hungry Horse