This suit probably wouldn't have gone too far if such a thing had occured in California. The 9th circuit court of appeals has ruled that the 2nd amendment does not guarantee an individual right to keep and bear arms. And California does not have an equivalent to the 2nd amendment in its state constitution. So we'd be pretty well SOL here from a legal standpoint. And attorney general Lockyer would be happy to help seize firearms.
The 5th circuit court of appeals has ruled the opposite.
The trick now is finding a case that pits one against the other in an "equal protection" issue and force SCOTUS to rule once and for all. (Considering recent moronic SCOTUS rulings, that may not be a great idea.)