The gun modification that made the Las Vegas shooting so deadly

Bump stocks make semi-automatic guns behave like fully automatics.

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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.

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