Via an email from Mike B.
The city of Seattle can’t ban firearms from being carried openly because of state preemption–so they do what they can:
Q: Is it illegal to bring an unconcealed airsoft handgun into a public place?
A: Seattle police say it is, and reference Seattle Municipal Code section 12A.14.083, regarding weapons in public places.
That states: “It is unlawful to knowingly carry or shoot any spring gun, air gun, sling or slingshot, in, upon, or onto any public place.”
“An airsoft gun specifically fits into that weapons code,” police spokesman Jeff Kappel said.
But police note the above code does not reference or regulate the carrying of firearms which are different from airsoft guns.
So I could legally walk down the sidewalk with my fully loaded (18 + 1 of .40 S&W) STI and a spare magazine openly displayed in a holster on my belt and someone else with an unloaded Airsoft gun in their backpack could be end up paying a fine of up to $500 and/or spend two months in jail for a first offense (up to 12 months for a third conviction).
Bigots, they try to get away with whatever they can no matter how ridiculous it is.