So, I work at a local firearms shop and we had a customer who resides in Multnomah County inquire about the NFA procedures with Sheriff. I know how Washington County does things, but not Multnomah. I put in a call and they returned it after a week with some startling info. They charge a $35 administration fee so they can run a "local background check" on you and have someone "review your paperwork." ...So, they are basically extorting $35 from you to give you sign off.