Local officials point to a .50-caliber assault weapon during a 2005 news conference in Chicago, a year before Cook County officials enacted an assault weapons ban. The law has been upheld by trial and appeals courts. On Thursday, a federal appeals court again kept the law in place.

Local officials point to a .50-caliber assault weapon during a 2005 news conference in Chicago, a year before Cook County officials enacted an assault weapons ban. The law has been upheld by trial and appeals courts. On Thursday, a federal appeals court again kept the law in place.