The shooter in Monday night's attack that left five dead used an AR-15 "Ghost gun." The gun's receiver -- the heart of the weapon that houses the firing mechanism -- didn't have a registration number from a manufacturer, meaning authorities had no idea of its existence. Zusha Elinson, co-author of American Gun, has tracked the rise of these guns for years. Many have been used by gangs to make it harder for police to trace their weapons. Zusha discussed such weapons on The Journal podcast in 2021.
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