UBCs won't work. Period, full stop. Releasing certain medical information (like psychiatric treatment/commitment/adjudicated bat**** crazy info) being added to the NICS database would "strengthen" background checks without resorting to a UBC. But as always, this would only impact the law-abiding, and not the criminals bent on doing harm.
Right. UBC is impossible without registration.
If trump ends up being the president that paves the way for registration....