<P> The Second Amendment (Amendment II) to the United States Constitution protects the right of the people to keep and bear arms and was adopted on December 15, 1791 as part of the Bill of Rights . The Supreme Court ruled in the 2008 Heller decision that the right belongs to individuals in their homes for self - defense . while also ruling that the right is not unlimited and does not preclude the existance of certain long - standing prohibitions such as those forbidding "the possession of firearms by felons and the mentally ill" or restrictions on "the carrying of dangerous and unusual weapons ." Prior to Heller, the Court had affirmed only a collective right to own guns for military service, not an individual right . State and local governments are limited to the same extent as the federal government from infringing this right . </P> <P> The Second Amendment was based partially on the right to keep and bear arms in English common law and was influenced by the English Bill of Rights of 1689 . Sir William Blackstone described this right as an auxiliary right, supporting the natural rights of self - defense and resistance to oppression, and the civic duty to act in concert in defense of the state . </P> <P> While both James Monroe and John Adams supported the Constitution being ratified, its most influential framer was James Madison . In Federalist No. 46, Madison wrote how a federal army could be kept in check by state militias, "a standing army...would be opposed (by) a militia ." He argued that state militias "would be able to repel the danger" of a federal army, "It may well be doubted, whether a militia thus circumstanced could ever be conquered by such a proportion of regular troops ." He contrasted the federal government of the United States to the European kingdoms, which he described as "afraid to trust the people with arms," and assured that "the existence of subordinate governments...forms a barrier against the enterprises of ambition". </P> <P> By January 1788, Delaware, Pennsylvania, New Jersey, Georgia and Connecticut ratified the Constitution without insisting upon amendments . Several amendments were proposed, but were not adopted at the time the Constitution was ratified . For example, the Pennsylvania convention debated fifteen amendments, one of which concerned the right of the people to be armed, another with the militia . The Massachusetts convention also ratified the Constitution with an attached list of proposed amendments . In the end, the ratification convention was so evenly divided between those for and against the Constitution that the federalists agreed to the Bill of Rights to assure ratification . </P>

The second amendment to the u.s. constitution deals with