Any attorney can tell you the wording in the 2nd Amendment is vague and that the U.S. Supreme Court has allowed the private ownership of firearms as a courtesy and privilege.  You do not have the right to own and use firearms.

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.

The 2nd Amendment can be dissected into 3 distinct parts.

A well regulated Militia
(1) A well regulated Militia has been provided for by the establishment of the National Guard and a standing army. At the time of the writing of the Bill of Rights there was no National Guard or standing army.  Also, a militia already exists in the form of all armed services.

(2) The word "regulated" supports the fact and demands that there must be organization within a said militia.  Lack of "regulation" or organization may and can pose a threat in and of itself. The word "regulated" can be interpreted to include the participation of municipalities, states and the Federal government to regulate or control firearms by any means.  With the addition of "well" in the statement the amendment requests and demands more than basic or adequate regulation exist.

Also the letter "A" in "A well regulated Militia" refers to one single militia, not several.  Again, this has been addressed by a standing army or National Guard.

being necessary to the security of a free State
(1) Many "free states" exist without the need for firearms, therefore this statement is no longer valid.  It is moot.
(2) The "security" for the United States has already been provided for through the creation of a standing army and/or National Guard.

the right of the people to keep and bear Arms, shall not be infringed.
(1) This can be interpreted as the people already having the right to keep and bear Arms by joining and participating in a standing army.

(2) The Federal government can, under the structure of this writing, hold and control all Arms and parcel out or distribute said arms if needed for the people to "keep and bear" which does not infringe upon anyone's rights. Nothing is addressed about gun ownership in the 2nd Amendment. The authors were not stupid men and intended for this amendment to be flexible and subject for debate as time dictates.

All-in-all, if you own a gun it's because you are currently allowed to and at the government's enjoyment.  You can lose this priviledge at any given time.  Personally if they have to pry your dead, cold hands from your gun, the better.  I have noticed that gun owners aren't scholars by any means.  If you're a gun owner, give it up and pursue something that will benefit humanity.  Visit your library and read books, collect stamps, help at a homeless shelter.  Do something besides push your paranoia on others.