Looks like a carbine conversion kit for a Jericho pistol.
Mako Group makes a similar product for Glocks and SIGs.
http://www.themakogroup.com/category_s/81.htm
Interesting idea, but it seems like another "answer to a problem that doesn't exist" type situation. Seems like a real carbine or long gun would be a better choice for almost anything.... except maybe to increase difficulty during modern-gun hunting season. What do you gentlemen/experts think?