The 2nd Amendment
A 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.
In Basic English: The 2nd Amendment protects the right to own guns. There is debate whether this is a right that protects the state, or a right that protects individuals.(http://mrkash.com/activities/billofrightsexplained.html)