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 first ten amendments contained in the Bill of Rights. well regulated militia being necessary to the security of a free State, the right of the People to keep and bear arms shall not be infringed. On December 15, 1791, the Bill of Rights (the first ten amendments to the Constitution) was adopted, having been ratified by three-fourths of the states.