Openly defy this law, as was done in CT and OR.
I used to shoot NRA/CMP service rifle matches. What’s weird about Oregon, is that there are a LOT of hardcore liberals that are into shooting/hunting/etc... I literally have been on the firing line with a longhaired birkenstock wearing pot smoking hippie wannabe. (he beat me soundly BTW). This may pass in the legislature, but a state ballot measure will probably overturn it.
Oregon is not a liberal state, it is a libertarian state.
Universal background checks are the backdoor to registration. The governement wants to know who has guns. Requiring all transactions to be recorded is the way to get there.
And your licenses and permits for the other nine amendments of The Bill of Rights had better be up to date too.