Here ya go. These can be had in 50 caliber, 58 caliber 50 caliber/20ga and double 20 gauge. AND you can get a detachable shoulder stock.
http://www.davide-pedersoli.com/risultati-ricerca-armi.asp?l=en
Scroll down and you can see the prices for the guns. I am not sure about the stock options.
http://www.cherrys.com/ped_pist.htm
I like the double 20 gauge. And I load a 20 gauge shell with two 54 caliber balls.
http://www.davide-pedersoli.com/risultati-ricerca-armi.asp?l=en
Scroll down and you can see the prices for the guns. I am not sure about the stock options.
http://www.cherrys.com/ped_pist.htm
I like the double 20 gauge. And I load a 20 gauge shell with two 54 caliber balls.