The Second Amendment upon which all the debate regarding guns in the United States rests is only 27 words but has inspired countless books and articles. Here are a couple of addition sources of information to look at:
Part of Exploring Constitutional Law, a website put together by Douglas Linder at the University of Missouri-Kansas City School of Law. This link will take you to the part of the site that deals with issues on the Second Amendment.
Founded in New York State in 1871 by Civil War General Ambrose Burnside, The NRA is a non-profit organization dedicated to the promotion of the Second Amendment right to bear arms.
The Institute for Legislative Action (ILA) is the lobbying arm of the NRA. Established in 1975, ILA is committed to preserving the right of all law-abiding individuals to purchase, possess and use firearms for legitimate purposes as guaranteed by the Second Amendment to the U.S. Constitution.
Formed in 1961 the National Shooting Sports Foundation is the trade association for the firearms industry. Its mission is to promote, protect and preserve hunting and the shooting sports.
The Second Amendment Foundation (SAF) is dedicated to promoting a better understanding about our Constitutional heritage to privately own and possess firearms. To that end, we carry on many educational and legal action programs designed to better inform the public about the gun control debate.
A branch of the Justice Department, Bureau of Alcohol, Tobacco, Firearms and Explosives is responsible for the investigation and prevention of federal offenses involving guns, arson, and illegal alcohol and tobacco.
Founded in 1974 as the National Council to Control Handguns, renamed in 1980 to Handgun Control Inc. and once again renamed in 2001 after Jim Brady who had been shot during the attempted assasination of President Ronald Reagan in 1981, the Brady Campaign is a non-profit Gun Control organization.