You mean if I have a trust I am unable to get a C&R FFL?
An individual, LLC or corporation can get a C&R, but a trust can't, because of the way "person" is defined in the Gun Control Act:
(a) As used in this chapter—
(1) The term “person” and the term “whoever” include any individual, corporation, company, association, firm, partnership, society, or joint stock company.
...
18 USC 921
As you can see, there is no mention of trusts...