Whether they “work” depends on your goal. If your goal is to discourage people from owing guns I’m sure they work quite well.
Background checks are already in place.
Their argument is that they don’t.
Their goal is to establish a new background check procedure which will be a national registry of gun owners.
Their version of gun control is really about citizen control. If they were serious, they would go after their voters in the hood. Take a look at their voters did in Chicago over the weekend.