one does not have to register anything or fill out any forms in order to have the Constitutional right to a speedy public trial. It is automatic.
Now consider the situation if you do not register a gun. Is the Second Amendment somehow instantly suspended? Did it vanish? Do you somehow lose the right to keep and bear arms? Certainly not.
If you can lose a "right" by not filling out a piece of paper, then it is not a right. It is a privilege granted by the government, which is a different thing altogether. In the area of government, a privilege is a special permission or immunity granted by a government, it is generally related to the use of some public facility (such as driving on the streets, or using the public library) and it may be suspended or revoked even for minor infractions or misdemeanors.
In sum: Rights do not require government registration, certification, or approval, and are not subject to any form of taxation — otherwise they are not rights, they are privileges granted at the discretion of the government, controlled by the government, and revocable by the government.
http://keepandbeararms.com/information/XcIBViewItem.asp?ID=1052