When you fill out the paperwork at the gun dealer, that is not registering the gun in your name. That is simply a transfer from a licensed dealer to you. What you do with the gun afterwords is your own business. You are under no obligation to tell the dealer anything about what you intend to do with the gun, other than answering the questions on the transfer record. I used to have an FFL years ago, and unless they have changed the laws, the dealer doesn't even send a copy of the transfer form to the BATFE unless he is going out of business and turning in his license. Normally, the forms just stay in the dealers records. They have to be accessible if the BATFE wants to see them, but they don't generally get a copy of them. Like I said, it was years ago, the laws may have changed some on that point but, like I said, once you have filled out the transfer record, and legally purchased the gun, it is yours do do with whatever you please, as long as it is within the law. There is no law that even says you have to have a bill of sale if you sell one of you personal firearms, athough it is a good idea, especially if you don't know the person you sold it to or bought it from from for that matter.