Can a Utah resident buy guns in Nevada without an FFL???

Just like the question says.The gun is a 1951 Walther PP. The person in question (My Dad) is perfectly legal to buy guns in Utah. Can he buy this gun (I'm paying) in Nevada without a ffl being involved??? Can we just pay and take it with us? We're heading that way on Saturday, to go home from California, and I saw it on the way in, and now I wish to purchase it on the way back. All I want to know is if we can do this. I've heard that as long as a person is a resident of one of the adjacent states, the purchase does not require an FFL... Thanks!!!!!