DO NOT REGISTER
There are several option available to allow you to refuse to register LEGALLY. Check out guncompliantstocks.com for their solutions to AR's, AK's, FAL's, and several others. The other options are to disassemble your weapons just enough to remove the 'evil' parts from them, ie remove the upper receiver and pistol grip from your AR, and store these parts seperatly.
By registering ANY firearm, you are allowing them to turn your RIGHT into a privilege. A privilege can be granted, or revoked, by the one offering it. If whether or not you can continue to own your firearm depends on whether or not you complete and submit a registration form, it has ceased to be a right, and become a privilege. Article II of the US Constitution guarantees us the RIGHT.
What if, in order to worship in the manner you desire, you were required to register your bible, koran, etc and any other "religious objects", and failure to register would result in the confiscation of the items, and your loss of the ability to worship, as well as criminal charges.
Or, in order to exercise your freedom of speech, you were required to register your voice, computer, pens/pencils/paper/ etc and failure to register them would result in confiscation of those "means of communication" and the forfeiture of you ability to speak, and again, criminal charges.
In this light, it's not hard to see that Registration is unconstitutional, and CANNOT be required in order to exercise a RIGHT.
Do not allow the HCI crowd to turn your Right into a PRIVILEGE. DO NOT REGISTER.
-Spyderman