FILE - In this Oct. 4, 2017 file photo, a little-known device called a "bump stock" is attached to a semi-automatic rifle at the Gun Vault store and shooting range in South Jordan, Utah. New federal rules would be the "the smartest, quickest" way to regulate the device the gunman in the Las Vegas massacre used to heighten his firepower, House Speaker Paul Ryan said Wednesday, Oct. 11 in remarks that suggested Congress was unlikely to act first. It remains unclear, however, what if any action the federal Bureau of Alcohol, Tobacco, Firearms and Explosives will take on so-called bump stocks. (AP Photo/Rick Bowmer)
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