The first image looks like a Winchester 1866 "Yellow Boy", but it has no magazine tube... It appears like it has a water-cooling jacket over the barrel, like a belt-fed water-cooled machine gun. Maybe this was an early attempt to solve handling the hot barrel without a forend... Also, looks like a Mannlicher-Shoener rifle in the background, can't ID the one to the right.
That pistol with the multiple barrels is said to be French designed, but it has a similair design to the original John Browning (not his more famous son), who invented the Harmonica rifle, which worked on a similar principle.
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