Uh, #5 is incorrect, the Supreme Court overturned DC's handgun ban in the Heller decision:
"On June 26, 2008, the Supreme Court affirmed the Court of Appeals for the D.C. Circuit in Heller v. District of Columbia. The Supreme Court struck down provisions of the Firearms Control Regulations Act of 1975 as unconstitutional, determined that handguns are "arms" for the purposes of the Second Amendment, found that the District of Columbia's regulations act was an unconstitutional banning, and struck down the portion of the regulations act that requires all firearms including rifles and shotguns be kept "unloaded and disassembled or bound by a trigger lock." "Prior to this decision the Firearms Control Regulation Act of 1975 also restricted residents from owning handguns except for those registered prior to 1975."