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.

Militia has two meanings: soldiers who are also civilians and a reserve military force. ( Also the lastest meaning deriving form the labeling of the paramilitary outlaws). Key word CIVILIANS.

Security of a free state: a state free from illegal federal interference or oppression. Hence freedom from the federal goverment becoming to powerful and not answering to the majority of people.