FILE - This Nov. 27, 2019 file photo shows "ghost guns" on display at the headquarters of the San Francisco Police Department in San Francisco. Chicago and three other cities sued the federal government Wednesday, Aug. 26, 2020, to stop the proliferation of what are advertised as easy-to-assemble "ghost guns" that require no serial numbers or background checks. (AP Photo/Haven Daley, FIle)
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