There's a push to renew the assault weapons ban that ran from 1994-2004 despite a complete lack of evidence that it had any efficacy whatsoever. 

A left-leaning blogger who writes under the handle "Kontradictions" has a magnificent, must-read piece on why it's a silly idea to ban so-called assault weapons isn't the right way to go:

Summary
If gun control advocates want to actually have meaningful discussion and debate about the “assault weapon” and “high capacity” ban, they MUST address these questions:
- Why ban cosmetic features?
- Why ban guns used in a mere 2% of crime?
- Why base gun control legislation on rare and statistically insignificant mass shootings to begin with?
- Why ban magazines that have been consistently sized since their invention?
- How would banning these magazines have saved lives, given that all a shooter needs is multiple magazines and 3 seconds of time (i.e. Cho)?
- How will a ban on either these weapons or magazines reduce crime, since there are many millions of them legal and available anyway, especially since production has ramped up after the ban’s expiration?