I know its a le meme but the uppercut is basically a Colt Walker. 1847ish I think and was made because a Texas Ranger officer wanted a pistol that could take down a man OR a horse. A bunch of the original 5000 went back to be fixed since the load was so hot too, a pretty interesting forgotten weapons video about them is available!
The Uppercut is a fictional converted revolver that fires .45-70 rifle rounds instead of the pistol cartridges. The weapon in the video is probably as close as it gets to that firepower. The real-world parent of the Caldwell Conversion would be the Colt Open-Top revolver from 1871, which was based on the trend at that time to convert cap'n'ball guns to load cartridges, but was actually built from scratch rather than a conversion. The Caldwell Conversion in the game is a fully invented gun that we assume could handle the strong force from the larger caliber rifle round when properly reinforced.
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