The significant part about a trust that I see is 1. My kids, brothers will be able to use it without myself being present and 2. When I die, they can keep it if they want them. I'm assuming on an individual trust, you would have to sell it to a dealer or pay for another tax stamp
The thing I don't like is that is appears to take longer to get approved by the ATF
Correct on the "others using it" part as long as they are 21 and "legal to possess" ..but all "responsible parties" in a trust must also go through the background check and fingerprint card since the change in 2016 so multiple people must now be "cleared" before the tax stamp can be issued -- all trustees/partners etc are considered "responsible parties"
As far as someone else getting it after you die without paying for a tax stamp goes, a form 5 transfer form (which is a transfer without paying the special use -$200- fee) can be done in a will, you can will your nfa items to any "beneficiary " you do not need a trust to do this. They will still need to file a form 5 transfer if they are the beneficiary after you die on a trust.
Trusts used to be the way to "skirt" the background check part before the new law in July of 2016, since the new law was passed- a trust does not have quite as many benefits and it now has more hurdles due to the multiple background checks and fingerprint cards that must be submitted with the trust. It still has its benefits in certain situations though.
A trust does not exempt anyone from the current laws or regulations.
Trusts submitted before 2016 did not have to go through a background check for a tax stamp, but if that trust submits for a new tax stamp then the new law pertains to the new submission and all responsible parties must submit to the bg check and fp card.
There are ways to "extend" a trust over a longer period of time, but all trusts will end once the grantor dies- the assets must be distributed to its benificiaries over time.
Trusts can be very simple documents, or can be highly complicated-- not all states require that an attorney actually write the trust, but it's always a good idea to contact and pay a local state attorney to make sure your trust is legal, as if it were ever to be determined as not a leagal trust it would automatically end and its assets could be lost. NFA trusts need special "conditions" added
My suggestions is to get general information about trusts online from people like mcali2 or myself or others, but contact an actual local state attorney with your questions to draft your trust and dont use those generic/ cheep/fast trusts.