In the cases I've seen state first hand, state law regarding NFA items usually just provides a blanket exemption for legal ownership so long as the item was procured in compliance with NFA procedures.
In those states, so long as the NFA branch issues the stamp and you are (federally) legally allowed to possess the item under the NFA, it doesn't matter whether you or a trust owns it.
Of course, the trust must be valid under the trust law of the state you reside in or else it cannot legally own the items, but competent trust attorneys are not too hard to find.
I think this was meant in reply to the comment about NFA weapons and crime. If so, yeah, I find that particularly interesting too.
It also fits with the published data showing that police officers commit violent crimes at a significantly higher rate than non-LEO concealed weapons permit holders.
In those states, so long as the NFA branch issues the stamp and you are (federally) legally allowed to possess the item under the NFA, it doesn't matter whether you or a trust owns it.
Of course, the trust must be valid under the trust law of the state you reside in or else it cannot legally own the items, but competent trust attorneys are not too hard to find.