That's going to be a fatal job for agents.
Also if they do get to this point then everyone who has played nice with the STUPID LAWS will jettison them by the roadside.
Illegal silencers, sawed off shotguns, homemade machineguns .... why will people obey ANY gun law once the ATF agents are out in 'force'?
Ummm, I think most Americans will grumble but would register their guns as directed. I believe that there is a limit beyond which any person can not be pushed. However, most Americans are heavily vested in their jobs, family, church, community, etc, etc. Thereby, the metaphorical “line in the sand” that an American must step across and essentially become a wanted felon is much further out than the gun registration issue. Soooo, there you have it...