Jump to conclusions much? You take your gun in and ask how much you would get for it in trade for what you want. Before you agree to the deal, ask for your gun back. It is still your gun. Tell them the amount is acceptable and fill out the 4473 before any money changes hands. If you don't clear, walk out of the store with your gun. They never took possession of it. You only had it appraised.
And this.