They will be very sorry if they do that, all of them. That's a statement of fact, not a threat.
FYI, I do not know a single gun owner who would abide by any restrictions. Travis McGee is right, such an act would invalidate our obligations to the feral.gov, and I can see a lot of folks making "machine tools" in their garage or basement...happy switches, supressors, etc. Further, being in Texas I haven't yet met the cop who's suicidally stupid enough to help the ferals out at all. I would hope that the governor and legislature would deputize all citizens and otherwise tell the ferals to fornicate themselves.
Molon Labe, motherphockers!