As of today - July 13, 2016 - rule 41F goes into effect for purchases of NFA firearms such as suppressors (silencers) and SBRs. For purchases going forward the process is essentially the same for individuals and trustees of gun trusts. So one of the key benefits of using a gun trust is now lost: simpler registration process. But there are still benefits to using a gun trust rather purchasing a NFA firearm individually.
Thomas J. Bouman