I think this fits here at Legal.
Scenario: (1) I hear of a gun I'm interested in; (2) it's in another state; (3) seller prefers private sale; (4) I drive to other state, range-test, etc. & buy gun, drive home.
Depends on what two states you are talking about. You had better be sure before you do it too.
I seem to remember that it was OK for an Ohio resident to go to an adjoining state to purchase a firearm, but I don't know if that is still the case. For my own purposes, I know that if I were to sell a firearm in a private sale within Ohio, that I would ask for proof of residency and age.
This is certainly not to be considered legal advise. Be sure to check ALL local, state and federal laws before proceeding.
------------------ RKBA!
"The people have the right to bear arms for their defense and security"
Ohio Constitution, Article I, Section 4 Concealed Carry is illegal in Ohio. Ohioans for Concealed Carry Website
Federal law as I read it states that it is illegal for someone who is prohibited by the laws of his state from owning a gun to buy a gun in another state. Otherwise, you're ok on the federal level. On the state level? As Bluesman said, you better check carefully.