ORS 166.170
ORS 166.170: State Preemption of Firearm Regulation
(1) Except as expressly authorized by state statute, the authority to regulate in any manner whatsoever the sale, acquisition, transfer, ownership, possession, storage, transportation, or use of firearms or any element relating to firearms and components thereof, including ammunition, is vested solely in the Legislative Assembly.
(2) Except as expressly authorized by state statute, no county, city, or other municipal corporation or district may enact civil or criminal ordinances, including but not limited to zoning ordinances, to regulate, restrict, or prohibit the sale, acquisition, transfer, ownership, possession, storage, transportation, or use of firearms or any element relating to firearms and components thereof, including ammunition. Ordinances that are contrary to this subsection are void. [1995 s.s. c.1 §1]
Oregon Constitution Art. I § 27: Right to Bear Arms
The people shall have the right to bear arms for the defence (sic) of themselves, and the State, but the Military shall be kept in strict subordination to the civil power.