You have a copy of the FFl sent, faxed or emailed to Aim then order and pay for the gun. It will ship to the dealer and you pick it up there where you will pay their fee and do a 4473.
"War is an ugly thing, but not the ugliest of things. The decayed and degraded state of moral and patriotic feeling, which thinks nothing is worth war, is worse. A man who has nothing which he cares more about than his own personal safety is a miserable creature, and has no chance of being free unless he is made free and kept so by the exertions of better men than himself" John Stuart Mill