Existing law does not indicate cons utionality, otherwise all laws are cons utional. We know that to not be the case.
Regardless, legislation is all that is needed to do a whole heap of that won't get done. "all it takes"
you could do away with the BoR with enough congressional votes.
This doesn't even begin to address the efficacy of a registry. There are states with gun registries, do they rise above the statistical noise in efficacy?
Rate vs gun related homicides rate
NY 5 gun related homicides - requires gun registration
Mass 3 gun related homicides - neither requires nor prohibits gun registration
Nah