I'm a liberal who will probably never own a gun. I think, however, that bills like these are gutless attempts by well-meaning politicians to make some progress on the persistent problem of gun violence.
Other countries, like Japan, England, and Canada, have prevented gun violence through a long history of prohibiting gun ownership. Those countries, however, have other types of violence.
Altering gun ownership laws will never fly here in the USA. There are simply too many guns out in the population, both legal & illegal, to make a realistic dent in gun violence.
The truth is that if there were an easy answer to preventing gun violence, we already would have implemented it.