I thought there were no restrictions on buying a long gun from a FFL in another state unless it was an NFA item. My cousin is a Florida resident and he purchased a Remington 870 Police Magnum from a Louisiana FFL just a few months ago. I came close to purchasing a Remington 700P from an Arizona pawn shop in 2005 and an AK74 from a Florida gun store in 2007. IIRC both dealers said it was no problem that I was a Louisiana resident, although the Arizona dealer kind of balked when I told him I was going to Fedex the rifle to my home address because I flew in.
Then again, there could be a state law that I am unaware of that overrides this.