Las Vegas shooter's rifles had 'bump stock' modifications

LAS VEGAS — The man behind Sunday night's atrocity had nearly 2 dozen weapons in his hotel, including rifles modified with a bump stock. <br /> <br />POPULAR MECHANICS <br />http://bit.ly/2fPOkSB <br /> <br />BUMP FIRE SYSTEMS <br />http://bit.ly/2xfVX7j <br /> <br />BEARING ARMS <br />http://bit.ly/2g9KaSr