George Zimmerman, the Florida man who shot dead black youth Trayvon Martin, is auctioning off the gun used in the shooting. The shooting prompted nationwide civil rights protests. Some proceeds to challenge presidential candidate Hillary Clinton’s gun control policies. Department of Justice recently returned to George Zimmerman the Kel Tec 9mm gun that he used to kill Martin, an unarmed black teenager. The auction is being hosted by Gunbroker.com.