So cool that if someone manufactured an updated model today (fill the reservoirs at the gas station air pumps) I’d buy one today.
Saw a TV show that featured this air rifle once and it was impressive with a range over 50 feet.
The problem is that the new lines of high end air rifles, uses 4500lbs of psi.
There is a small underground movement to try to get these being made again. Right now you have to scratch build them yourself.
There is a version made by Crossman/Benjamin. It runs about $800, and delivers 10 shots of .357 95 grain bullets at about 900 fps. That is likely quite a bit more powerful than the Griondelli. They have a hand pump for it for about $179 more. You can pump it up for another 10 shots with about 200 pumps, as I recall, or refill it with a scuba tank.
3,000 psi is a full tank. It has a pressure gauge on it.
A pretty good approximation of the Girondelli. It is a bullpub design, but no extra tanks. Can take big game to 80 yards.
1 inch group at 25 yards, for 10 shots.
http://www.crosman.com/bulldog-synthetic
The Crossman has an integral suppressor and is very quiet.