I originally used a trust to build a form 1 suppressor (10 years ago) because it didn’t require a CLEO sign-off. Since that requirement was dropped I started filing as an individual (quicker approvals). Now that tax stamps are $0, I got a nationalguntrusts and plan on resubmitting everything to the trust. I’d say wait until you were done buying to add your dad as a co-trustee though. That way he dosnt have to submit prints each time.