Well fellers, there certainly was a problem when TC had to go to court, all the way to the SCOTUS to protect their company and their customers. The current position by the feds was written in 2011, quite a time gap from 1992 when TC won their case. Even that doesn't seem to address taking a frame originally configured or sold as a rifle and turning it into a handgun, only the reverse. IF I ever go that route, I'll contact them for clarification and documentation before I act.
I asked a simple question and got a pretty rude response for no good reason. If it wasn't Easter I'd tell you to kiss my ass.
