You cannot carry a loaded gun without a concealed carry permit. You must unload the weapon. No mention of unloading a detached magazine is mentioned.
95.095. Loaded Firearms. (a) It shall be unlawful for any person to possess a loaded firearm, whether the shell or cartridge is a blank or is live ammunition, while in a public place as defined in ORS 161.015.
(b) Nothing in subsection (a) shall apply to:
(1) A law enforcement officer in the performance of official duty.
(2) A member of the military in the performance of official duty.
(3) A person licensed to carry a concealed handgun.
(4) A person authorized to possess a loaded firearm while in or on a public building under ORS 166.370.
(5) A government employee or contractor of the City of Salem engaged in flight safety hazard abatement to comply with Chapter 14 of the Code of Federal Regulations, Part 139.337 at McNary Field. (Ord No. 29-96; Ord No. 54-05)
A PUBLIC PLACE IS:
161.010(10) “Public place” means a place to which the general public has access and includes, but is not limited to, hallways, lobbies and other parts of apartment houses and hotels not constituting rooms or apartments designed for actual residence, and highways, streets, schools, places of amusement, parks, playgrounds and premises used in connection with public passenger transportation.