I've read about this place. They also have a never fired pfeister (I think that's how it's spelled) volley gun. I keep wanting to get there since moving here. Just can't seem to get the time. It is absolutely on the "near future" list of things to do.
When I saw those firearms when I was younger, they were on display in the county complex building (I believe it's the same collection). I'll have to go see them sometime.