John,

From what I understood, this is a single shot with the patent being related to the firing mechanism which is just one inch longer than the barrel. I am guessing that it should be possible to build a more "sporter-like" gun with this mechanism. Possibly a very short double rifle too . . .

This, of course, is speculation on my part and I'll wait for Signor Rigido to respond. I have sent him a link to this thread for his comments. He was somewhat reluctant about writing in English, but I can't see any problem at all with his English. if any member here is fluent in Italian and would like to communicate and help with translation, I would be most happy to make the necessary introductions.

Good hunting!