Nullification is an old pipe dream. The Constitution clearly says that federal law trumps state law. This is a stupid waste of resources and money better spent in getting laws repealed, changed, or enacted, that are not jousting at windmills.
I have yet to hear anyone tell me exactly which federal law is it that should be nullified, other than all of them. Which is never going to happen. If you want to hand the anti-gun crowd something to rally to and the federal government a reason to crack down, keep passing nullification acts.