Well that's interesting! I hadn't seen one of those mounts before. Thank you!

My 45/70 is set up with QD rings on a Weaver base. I can easily pop it off if I want to use the sights. It returns to zero well when replaced. Love the little 2.5x Leupold for the Marlin lever actions:
[Linked Image from i.imgur.com]

[Linked Image from i.imgur.com]