Neat piece! I somehow missed that while plumbing the depths of Hermann-Historica for inspiration.
I used to joke that my cut-down Brown Bess was an 18th century "assault weapon" but the designer/builder of this went way further. Takedown, collapsible butt, short barrel; I think Eugene Stoner may have designed this in a previous incarnation. It was even updated to percussion.
The double-set triggers seem crazy, but the thing is essentially a shoulder-stocked pistol--and we do see set triggers on occasional pistols, even as early as this one (1760).
Any other good examples of historical rifles this short?
Jim