None of my firearms are "registered". And "felon in possession of firearm" is already a crime.
***And “felon in possession of firearm” is already a crime. ***
Felons are not required to register their guns.
http://en.wikipedia.org/wiki/Haynes_v._United_States
“The original Haynes decision continues to block state prosecutions of criminals who fail to register guns as required by various state law gun registration schemes.”