National Rifle Association (NRA): Purposes and objectives include protecting the right to keep and bear arms, furthering the shooting sports, marksmanship and safety training, and the promotion of hunter safety

S.649 Safe Communities, Safe Schools Act of 2013: Official U.S. Library of Congress information about S.649, Safe Communities, Safe Schools Act of 2013, addressing guns and firearms. Includes summary, full text, sponsors and congressional actions

Wikipedia - Firearm Case Law in the United States: Crowd-sourced encyclopedia article about decisions of the Supreme Court and other federal courts dealing with the Second Amendment, the Commerce Clause, and/or federal laws regulating firearm possession