I'm from Oregon and a tad bit up on our laws here (there are so few for firearms).
What is this "full carry premption" you mention?
We are a "shall issue" Concealed Handgun License (CHL) state.
The legislature has prempted all gun regulation unless it "expressly authorizes" such regulation. For carry, it has only authorized cities and counties to regulate the carry of LOADED weapons (by non CHL holders).
Without aCHL Oregonians can carry almost anywhere in the state but cities and counties are allowed to pass local ordinances to prohibit the carry of LOADED weapons. At last count there were 8 such cities and no counties (all in the anti-gun north part of the state). "Public buildings" (and their grounds) are off limits to any weapon without a CHL (city hall, county offices, schools, colleges, even the city water office).
Those with a CHL are exempt from any and all regulations not passed by the state legislature and can carry openly or concealed anywhere that state and federal law do not prohibit it.
State law only restricts such places (for CHL holders) as court facilities (but does not include any municipal court in the definition of a court facility)& secure portions of jails. Schools and colleges, airports (outside TSA), City hall, even the state house are all perfectly legal for a CHL holder to carry loaded and openly or concealed.
While NOT smart, it would be perfectly legal here to walk into school to pick up your child while openly carrying a holstered, loaded,handgun and spare mags.
So....are we "full carry premption"?