Anyone who can legally buy a gun can buy in Oregon. If you're a non-resident though, you've got to have it shipped to a FFL dealer in your home state.
At least you won't have to pay sales tax (there's no sales tax in OR)
Seeing how I live in Oregon, I've never seen the need to travel out of state to buy firearms.
UD
I know this thread is old but I found out something new today. I live in Vancouver and just bought a new 930 SPX at the PDX gun show today. I fully expected to have to have it transferred but was told only handguns and stockless rifles had to be transferred. I was unaware long guns could be bought across state lines with transfers.