The Second Amendment to the United States Constitution...

The Second Amendment (Amendment II) to the United States Constitution is the part of the United States Bill of Rights that protects the right of the people to keep and bear arms. It was adopted on December 15, 1791, along with the rest of the Bill of Rights.
In 2008 and 2010, the Supreme Court issued two Second Amendment decisions. In District of Columbia v. Heller (2008), the Court ruled that the Second Amendment protects an individual's right to possess a firearm, unconnected to service in a militia and to use that arm for traditionally lawful purposes, such as self-defense within the home. Additionally, the Court enumerated several longstanding prohibitions and restrictions on firearms possession that it found were consistent with the Second Amendment. In McDonald v. Chicago (2010), the Court ruled that the Second Amendment limits state and local governments to the same extent that it limits the federal government.

Text

There are several versions of the text of the Second Amendment, each with slight capitalization and punctuation differences, found in the official documents surrounding the adoption of the Bill of Rights. One version was passed by the Congress, while another is found in the copies distributed to the States and then ratified by them.
As passed by the Congress:
As ratified by the States and authenticated by Thomas Jefferson, Secretary of State:
The original hand-written copy of the Bill of Rights, approved by the House and Senate, was prepared by scribeWilliam Lambert and resides in the National Archives.