Bump stocks make semi-automatic guns behave like fully automatics. Subscribe to our channel! goo.gl/0bsAjO When a gunman opened fire on a crowd at a Jason Aldean concert in Las Vegas earlier this week, he was using a legal firearm. In the United States, semi-automatic weapons are available to the general public. Fully automatic guns are not. But there is a loophole. Gun owners can purchase a 'bump-stock' modification that takes advantage of recoil mechanics to make a semi-automatic rifle far more dangerous. And that opens up a grey area in gun control policy. For more on this topic, you can read Vox's German Lopez: www.vox.com/policy-and-politics/2017/10/4/16412910/automatic-guns-las-vegas-shooting Vox.com is a news website that helps you cut through the noise and understand what's really driving the events in the headlines. Check out www.vox.com to get up to speed on everything from Kurdistan to the Kim Kardashian app. Check out our full video catalog: goo.gl/IZONyE Follow Vox on Twitter: goo.gl/XFrZ5H Or on Facebook: goo.gl/U2g06o