Isn't it possible to hide ownership in a trust though
Aren't NICS checks only done on the trust it's self and not the trustees currently or did i misunderstand the process ?
I think you've misunderstood the process. See
Chapter 9 of the ATF's
NFA Handbook, especially 9.12.1:
9.12.1 NFA Transfers to other than individuals.
Subsequent to the approval of an application requesting to transfer an NFA firearm to, or on behalf of, a partnership, company, association, trust, estate, or corporation, the authorized person picking up the firearm on behalf of, a partnership, company, association, trust, estate, or corporation from the FFL must complete the Form 4473 with his/her personal information and undergo a NICS check. See also, question P60 in the ATF FAQs.
In a trust the trustees are the legal owners of the trust property, though the powers normally associated with legal ownership are limited by the fiduciary duties owed by the trustee to the beneficiaries, who each have an equitable interest in the trust property. (The distinction between legal and equitable interests in property is an arcane one going back to the days when English courts of law and the
Court of Chancery were separate institutions.)
This issue of a prohibited person potentially taking possession of an NFA firearm under the terms of a trust is why it is important that your trust make it clear that no prohibited person may be a trustee, and that no transfer of the trust property to a beneficiary should occur until after the appropriate paperwork has been filed and the transfer is approved by ATF. If your trust directs the trustee to transfer an NFA firearm to a prohibited person, that provision of the trust would be void as against public policy, but that doesn't mean it won't confuse the heck out of your successor trustee and potentially cause some real headaches down the road.