Where are they getting them one by one?
Mine aren’t registerd, so tell me again about the process?
If they were registered, who are the idiots they’d send to my door?
One way is increasing the number of crimes to felonies, adding ‘domestic violence’ to the list of things they can take your guns away on. Basically making you violate the laws unknowingly and then using that as an excuse to disarm people for things that have nothing to do with guns.
Second way is going after law abiding folks exercising their gun rights, like what is going on in West Allis WI right now where the guy is open carrying in his yard doing yard work and the cops come at him at gunpoint. Took his gun away.
Someone somewhere knows you have those guns. If you bought them at a store, their records can be searched and you are found out. If someone else gave them to you, the people who gave them to you, if they (being the last known owners) were ever questioned about where the gun was, would tell authorities you have them or go to jail.
If anyone around you knows you own guns, they could report you and you would become a candidate for a late night raid.
They are not doing that currently except to small time criminals, to hone their skills, but there could be a time when people will start being asked where their guns are so they can be confiscated. If you don’t turn em in during the grace period.
Anyone who hates you could (whether they know it or not) just say you had weapons and the cops would go and check it out.