Cool. Never heard of that old air rifle
The Girandoni air rifle was used by Lewis and Clark in part to scare the Indians.
https://www.grandviewoutdoors.com/guns/the-gun-that-actually-won-the-west-might-surprise-you/I'd like to hunt with one just to say I did and satisfy my curiosity, but I don't think I'd invest in the gun, tank and such.