After looking around for guns that may have come out of Silver Dollar City I don't think this would be one and as mentioned elsewhere here there was a Primative Arms Company in Branson, I do still think it's a Uberti built gun.
So in looking at the Silver Dollar City website and using their exhibit search I don't find a gun making exhibit. As I recall, when I visited in 1979, they had a gun building exhibit where they also demonstrated running ball and I believe they did some live fire of guns. We can probably all guess why this exhibit, intended to be historical, disappeared.