Some of the gun controls listed below represent Second Amendment restrictions Bloomberg and/or one of his gun control groups actively supported. Others represent instances Bloomberg and/or his groups fought against the exercise of Second Amendment rights, as in their opposition to campus carry for self-defense.
Here are Bloomberg's top ten gun controls:
Universal Background Checks—Bloomberg's support of universal background checks was made clear following the December 14, 2012, attack on Sandy Hook Elementary School. In the aftermath of that attack, On the Issues quoted him saying, "You have an issue where 90% of the public, 80% of NRA members even, say that they think we should have reasonable checks before people are allowed to buy guns–they all support the 2nd Amendment, as do I." The problem with Bloomberg's push at that time was that the Sandy Hook attacker stole his guns, so no amount of point-of-purchase gun control would have stopped his attack. The problem with his continuation of the same push now is that nearly every mass shooter of the last decade acquired his guns via a background check, so expanding checks to cover private sales would not have prevented the attacks.
Banning 'Assault Weapons'—Bloomberg has long advocated a ban on "assault weapons," but he admits securing the ban is an uphill battle because the guns are rarely used in crime when compared with other firearms. USA Today reported Bloomberg's push for a ban on "the manufacture and sale" of "assault weapons" following Sandy Hook. But in 2017 he told the New York Times, "You can have a ban on assault weapons. But assault weapons kill 400 people a year. They get a lot of press. But its 400 vs. 31,000 with handguns."