I have a McMillian Tactical that was given to me as a gift about fifteen years ago. I've got a new scope on the way as an upgrade and I'd like to get a Spuhr mount for it, but I don't know if the current Badger Ordnance base is tapered or not, and I can't find the paperwork for the rifle. Is it marked on the bottom? I didn't want to pull it off if there wasn't a way to tell.

By the way, anyone know off the top of their head what Spur ISMS will fit a Nightforce 50-25 X 56 F1 ATACR with a Badger base? I'm going to order one once I know if I have to get a new base as well.