Agreed. That it is more pretty than practical but it’s is John Moses Browning’s basic Superposed shotgun design with a 20ga barrel set and a 30-06 barrel set
The tang slider selects which barrel fires first (over or under)
The barrels are interchangeable to swap from rifle to shotgun
The Superposed was his last and renowned as his legacy design

I can’t usually find too much to fault with the man from Ogden UT

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There is room for all of gods creatures ... right next to the mashed potatoes