How do you enforce the requirement that private sellers have to participate in a background check? The only way it will work is for the government to maintain a record of what guns you own and a record of what you bought and sold.
That's the only way? You couldn't just run stings? I think so.
Every state that has a universal background checks has registration.
Not true. There is no registration in PA and all sales have to go through a dealer. Except to family.