In the spirit of paranoia inspired by Hillary's and Obama's endorsement of the Australia model of forced gun confiscation, I started speculating on the mechanics of the ATF's plan. I am ignoring for the moment the firefights and ensuing civil war.
Hard to say, but the two top candidates:
Registered NFA items, especially machine guns.
Collect the log books from FFL's containing each gun and who it was sold to.
Don't think it would get past these two lists before the fighting starts, but if it did:
All credit card transactions for ammo, online and brick and mortar.
All hunting licenses
All gun accessory purchases
Active posters on gun forums
All posters on gun forums.
Anybody COMPLETELY off the grid?