Nifty examples of unusual revolvers, but in the image the cylinders would never actually line up with the barrel at all

Consider this:

On most revolvers, this circled feature would be the hinge pin for the cylinder crane, allowing it to swing out for reloading. But, this thing is clearly not “most” revolvers. That’s not a pin.

That circled feature is in line with the bottom chamber of the revolver. Nothing else is lined up with any chamber. That circled feature has to be the barrel for the revolver cylinder.

The big barrel above it is a secondary, single-shot shotgun barrel. This barrel is much larger than the chambers in the revolver cylinder; it can’t be driving the small projectile fired from those chambers.

The only way this gun works is if it is a two-barreled gun like the Lemat. The revolver fires from the bottom barrel rather than the top, like the Rhino.