It's been more than seven years since a 17-year-old dressed in military gear killed 15 people in a shooting spree in Winnenden, Germany, a picturesque little town just outside of Stuttgart. Since then, a rare shooting tragedy in Germany, the country has implemented a national firearms registry, requiring the owners of 5.5 million legally owned guns to register them with the government. The scale of gun ownership took photographers Miguel Hahn and Jan-Christophe... (GunPolicy.org)