In a landmark opinion Friday, the U.S. Court of Appeals for the D.C. Circuit reversed a lower federal court on all counts and concluded that "the Second Amendment protects an individual right to keep and bear arms."

The case, Parker v. District of Columbia, was brought by six D.C. residents who want to possess functional firearms within their homes for self-defense. Their lawsuit was not about machine guns and assault weapons. They didn't ask for the right to carry guns outside their houses. Parker was about ordinary handguns, in the owner's private residence. ...