the lever have an excenter that move the barrel forward, you see it in the video.
the Löbnitz action must have been from the late 1830s. while the rifle here is without doubt a hunting rifle the norwegian comrade here shoots a model 1841 pistol so we see how it works.
https://www.youtube.com/watch?v=8R2SN0GmP6M

he bits the paper cartridge but it was maybe possible to load the paper cartridge complete into the chamber.

here is a pair of more elegant made civil pistols https://www.lot-art.com/auction-lots/A-P...-28.5.20-morphy

Based on the Loebnitz system, primarily used in rifles used by the Norwegian military until they were either converted, scrapped, or replaced by cartridge rifles. German nickel silver blade front sights dovetailed in horizontally to the top flat of octagonal barrels. Like other Kammerladers, breech controlled by a crank on the right side which forces breech open and allows loading. Notch rear sight on scalloped out section of tang. Underhammer system with notch on hammer which catches on spring mounted on bottom of trigger guard. Bag grips checkered in two panels of point pattern checkering. Interestingly, at bottom on tangs is "1" and "2", indicating the pistols were manufactured as a pair. CONDITION: Very good. Metal is essentially dove grey with some old oxidation, action and trigger guard with some very light traces of case colors. Wood is very good, with some scattered marks from handling and operation, some loss of finish to high edges. Checkering is sharp. Bores are very good with strong rifling and some light black powder abrasion. Actions work appropriately when operated by hand. A neat pair of rarely seen pistols, as Kammerladers are primarily found as rifles. This is the only pair known to exist. EW Barrel Length: (Both) 7" Caliber/Bore: (Both) .60 Percussion FFL Status: Antique Manufacturer: Danish Model: (Both) 1841 Kammerlader Cavalry Pistols Serial Number

I think have seen this pistol before but not a hunting rifle. some of them must have been made because the rifle have SN 163.