It looks like Rossi was the first to do this. They have made a judge into a carbine. Saw one in the post exchange here at Ft Leavenworth yesterday. 18 1/2 inch barrel 3 dot iron sights with a rail on top also. Overall length seems to be about 28-30 inches with a short buttstock. It comes with 2 chokes for the 410 side. Listed for $475 in the px. looks like it might be a handy piece.