The “universal background Check” is just a way of advancing toward “universal gun registration”. The purpose is to make it illegal to sell or transer any gun without government permission.
Then, slowly and incrementally make government permission harder and harder to get.
Eventually, the idea goes, any gun not registered will be declared illegal, then incremental confiscation is already underway.
I do not think it will work, but it sure can cause a lot of problems and heartache on the way to defeating it.
I’ll bet they’ll go after the gun associations subscription lists to gather names.