Just to clarify…
Your gun trust is a legal document that creates a corporate entity. That document must be filed with the State in which you live. However, you do NOT have to give the State of list of firearms in the trust. But the trust MUST have some kind of asset. So my actual trust document has a $1 bill attached to it. This represents the “asset” around which the trust is formed. The document is a private document after that point. You can transfer asssets into the trust. And you can designate new beneficiaries without having to update the State’s information. So the State will have a record that you have a trust, but done properly, they will not have a record of your firearms. For this reason, it is certainly worth the $300 it takes to have a trust formed. It is worth having a NFA trust just to keep the legal system from deciding what happens to your firearms after you die. And if you do want / need to apply for an ATF tax stamp, it still makes it a faster / easier process (but plan on 11-15 months for the ATF to let you buy a silencer to protect your hearing).