LLC protects you personally from alot of ambulance chasing practices. It's relatively cheap, and it looks like you are serious about making this a money making enterprise. ATF doesn't like people going after FFLs as a way to buy guns cheap for themselves. IF you take a weapon into a personal collection, put it the book when it comes into inventory, goes out to your collection, NO 4473 required, and keep it in your collection for at least a year, they are good with that. See 478.125a of the reference guide.