I bought a gun from a guy in Wisconsin how do you get that gun in your name?
You would have to be a little more specific. If you purchased a
long rifle from him while you were in Wisconsin, any sort of
receipt of sale will suffice. If you purchased a handgun, NFA
weapon, or did not actually go to Wisconsin (bought it online, for
example), then you need to find an FFL licenced dealer to receive
the firearm for you. Your dealer will charge a receiving fee
(usually between $20 - $40), and a copy of their FFL will have to
be sent to the seller. The seller will then ship it to your FFL
(Type 1 or Type 2 only) dealer, and you will fill out the BATFE
Form 4473 at the dealer's when you go to pick up your firearm.