I believe there have been one or two built recently to prove the concept. They are very powerful air guns, and cost quite a lot. I think for the same original style, you may be looking at $5k-$10 for a handmade example. I may be low.
He and another guy built a couple, using more modern parts in many places. It mentioned that it took them 4 years to build them I think. I think somebody else built one or two to original style as much as possible.
The Girandoni Air Rifle is featured in a series of books by Dewey Lambdin known as the Alan Lewrie stories about a Brit naval officer's career starting as a midshipman. The author lives in Tennessee, IIRC. I highly recommend the entire series. If you like the Hornblower saga, you'll like the Lewrie stories.
The stories start a bit before the US revolution and it is very interesting to see that war presented from a Brit perspective. They continue beyond the Revolution to the long series of Brit vs France battles in the Caribbean. The Girandoni plays a role when Lewrie is battling French pirates off of the French territory of Louisianan.
The link tells a bit of the history of the air rifle and it's role in the Alan Lewrie tales.
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