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Audio and Text of DC v Heller Is Here, The Right to Keep and Bear Arms -- Check It Out
And take a listen to the questions of Chief Justice John Roberts to DC atty Walter Dillenger, who is a real tool.
http://www.oyez.org/cases/2000-2009/2007/2007_07_290/argument/
Then, just read the Constitution for yourself and don't bother asking what government folks "interpret the Constitution".
Then buy a gun, or many.