Over/under shotgun mechanism in action - GIF

Over/under shotgun mechanism in action.

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Previously:

https://www.homemadetools.net/forum/...5576#post82133
https://www.homemadetools.net/forum/...779#post118917
https://www.homemadetools.net/forum/...127#post125970
https://www.homemadetools.net/forum/...877#post105666

WAG, being that so many distinguishing features aren't visible, but this could be a Superposed by John M. Browning, his final long gun before passing away. And remains the standard of production O/U's to this day. IMNSHO.
I'm highly partial to his work; the absolute keystone of my desire to make things as a machinist. Still feels like yesterday, 57 years ago.