it was just put out that the POTUS could use an Executive Order to establish national database/registry and improve background checks
Without getting too political here, it's Joe Biden. He's been known for letting his mouth outrun his brain a few times, and this is one of them.
A national registry would have to go through Congress. So would any significant change to the background check system.
What could be done via EO? Maybe tightening states' reporting requirements to NICS, or (one I could get behind) encouraging more aggressive prosecution of straw purchases and other trafficking crimes.
Long story short, take what Biden says with a grain of salt.