Thankfully, Kommufornia is a minority in its draconian gun laws.
In Oregon, especially right on the border with another state, it is very clear that we may conduct face-to-face sales with anybody who is a resident of our state. Neither party must do anything in particular for the transfer to be legal except ascertain that the person is a resident of Oregon. It is very much like buying/selling a used TV or something. I, personally, make a bill of sale that I have both parties sign that has serial number info and drivers license of both parties, but that is because I am anal and OCD about my firearms records, not because of state or federal law.
What state are you in? That would be helpful!
.45acp, .40 S&W, 9mm, .38 Spl, .380 acp, 22lr
12 gauge, .223/5.56x45mm, 30-30 Winchester
2 Chron. 7:14 Christians must seek His face