I sent an email to Green Mountain barrels a while back about a scope base for their black powder barrels. I asked them since their barrels were drilled and tapped for a scope base, maybe they could tell me where I might purchase a base for one. I recently got a response giving me a bunch of buisnesses websites. None of which have a scope base for an octogonal black powder barrel. Why drill and tap a barrel for something that I am beginning to believe DOES NOT EXIST! And if it does exist, I wish someone could tell me where I could find one.