How or can a lower that was registered as a pistol be used as a rifle?   I’m not too sure I want to deal with making it an SBR, the associated cost and hassle isn’t worth it since I already have a few.   I think I remember you can go rifle to pistol, but you cannot go pistol to rifle, do I remember that correctly or do I have that backwards?  If that’s the case does that make any pistol lower legally unusable if the gun regulations proposed go into law?   I not looking for conjecture on if he can do it or why people won’t or shouldn’t take braces off, I get it, I’m looking for how to legally use the lower if things don’t go our way.

Pistol can go to rifle and back if you want.  A rifle can't go to pistol if it started as a rifle.

Thanks.