From Gun Buying for the Paranoid | Eagle Firearms
It is illegal for a dealer to sell a handgun to a resident of another state, without transferring the handgun through a local dealer in the buyers state. More painful for the buyer…great for us dealers! If you live in Oregon and purchase a handgun from a washington dealer (even if you walk into the shop) the dealer must transfer that handgun to a dealer in Oregon where you can pick it up. In this case the dealer in Oregon is responsible for the back ground check and transferring of the gun. This dealer will most likely charge you a transfer fee. Big chain stores have it easy as they can have you just pick up the gun at their store in another state.