In fact, according to an analysis by The Atlantic of 30 mass shootings from 2003 to 2013, broader background checks would have stopped only one: Douglas Williams’ slaughter at a Lockheed Martin plant.
and
Although there are millions of so-called assault rifles in circulation (3.3 million Colt AR-15s alone, for example), they actually are used in homicides less often than hammers and clubs. And that’s true for all rifles, not just the scary-looking kind. In 2013, FBI data show, 285 people were killed with rifles — and 428 with blunt instruments.
One of my favorite things about the article is that he is able to make all these points without even discussing the second amendment which I personally consider more philosophical and hypothetical than the actual reason I myself am involved with guns - personal protection.