Yep. The reason for universal background checks is so they can build a database of owners and guns. But I don’t see them as to try outright confiscation because that would immediately lead to a bloody civil war with a lot of gun grabbers dead. Instead after UBC they will institute a mandatory registration of all your guns. Then there will be random compliance checks (without a search warrant, of course) and if what you own doesn’t match the database, your guns will be immediately confiscated and destroyed and you will be jailed.
Next they will make the transfer of firearms from anyone to anyone else for any reason illegal. When you die the government comes and collects all your firearms and destroys them.
Stolen by the LEO's more likely.