There is a Collector's FFL for Curios and Relics (on C&R list, or 50 years old or older). No business needed, but you cannot buy newly manufactured firearms. A requirement of the C&R FFL is that you not be in the gun business and be buying to enhance your collection.
Go here: FFL FAQ
One of my dealers allows me to log into his wholesalers websites and look at inventory and costs. It is pretty amazing that the markup on guns is SO LOW. I think a lot of people think that dealers mark guns up a lot, and may make $100 or more per gun. That is just not so. A dealer may only make $30 to $50 on a $500 to $800 handgun. For that he has to keep all sorts of records, do the transfer, fund the inventory that may not sell, pay the rent on his building, pay for his staff, utilities, taxes, etc. Not to mention pay for the licenses required by the city, state, in addition to paying for the FFL license.A lot of people are under the mistaken belief that having an FFL means you can buy new guns cheap. Unfortunately this isn't the case. The money you would save buying new guns for yourself is nowhere near being worth the hassle. There isn't a large markup on new firearms.
Ahem, ahem, (in a loud whisper) Don's guns.I think a lot of people think that dealers mark guns up a lot, and may make $100 or more per gun.