You can be sure this is being backed by Bloomberg's Everytown movement. He is the funding source behind most all of this type of legislation across the country.
The wording also classifies an "assault weapon" as a weapon with a flash suppressor, muzzle brake, compensator or threaded barrel designed to accommodate the above. So LR or hunting bolt guns with muzzle brakes would be lumped in too, as well as any weapon capable of carrying more than 10 rnds. so kiss your ol marlin 22 semi auto good bye.
The suggestion of a law like this is totally preposterous, but not out of the realm of reality to get passed in a state like Oregon. I have been contemplating moving east of the Snake river for some time now, if this passes my decision making will be much easier.
The conservative radio programs have been very vocal about the nature of this bill. But history shows here in Oregon that conservative or even moderate middle of the road voters who would oppose infringement like this if they were only paying attention, often have more important things to do then send in their ballots on voting day. The liberals always show up. We'll see where it goes.