I purchase a Sig Pro 2022 in April and since then found I just don't shoot it much. I'd like to sell it in favor of a gun i'd get more use out of it. I've never sold a gun before so i'm not certain of my obligations outside of any other kind of sale. I have a few questions: What is a F2F sale and how does it work? If I sell over the internet, I assume I will need to verify the FFL provided and ship it to them. What do i need to know before selling?