Years ago I did this. It was a great experience with zero probs.
I needed a Form 6 and a Form 1, both of which are easy (and probably downloadable now). One key to state is that you're importing for your own ownership and use (not resale). The gun had to come to a FFL possessor.
To maximize convenience and minimize the FFL person's effort, I wrote a simple letter he signed, making me his agent for the purpose of picking the gun up at customs and delivering it to him directly, for the transfer process.
