At least one protester at Seattle's Capitol Hill Autonomous Zone (CHAZ) is armed with what appears to be a Desert Eagle.
From Wikipedia, on Washington laws, it says, "As a general rule, a person may legally open-carry in Washington state in any place it is legal to possess a loaded handgun, as long as it does not manifest "an intent to intimidate another or [warrant] alarm for the safety of other persons." To open-carry a loaded handgun in a vehicle (e.g, car, bus, etc ...) a person must have a valid concealed pistol license. The county sheriff or city police chief shall issue a concealed pistol license to any applicant, age 21 or older, who meets certain requirements, including no felony convictions, no misdemeanor domestic violence convictions, and no outstanding warrants. Open carrying of firearms is not prohibited by state law."