Need to give a big THANKS to Silencer Shop. They were kind enough to share with me the contact info for the state-level CLEO they're going to use to simply their CLEO Notification process. I've added the list here.

It currently contains only the states were suppressors are legal, as that's all SS really needs. If your state doesn't allow suppressors, but does allow other NFA items, feel free to provide me the info and I'll update the list.