with the 41F changes, there really isn't much of a difference any more. you still need photos, fingerprints, etc, no matter if you do Individual, Trust or LLC. the only benefit i like from Trusts is allowing multiple people access NFA firearms and having beneficiaries listed. a Trust is just better and has more options available.
is there a reason you want to use your LLC, when filing as an Individual is exactly the same since you are the only one who can access the NFA items?
Do you have a family? Do you want them to use your cans/SBR's, etc? if so, a trust is probably your best bet.
just stuff to think about.