Their law (Seattle) on all guns in parks goes against state law & state constitution. One thing leads to another, and this unconstiututional law will be challenged shortly as folks who don't want to see a consistent degradation of our rights band together. This ruling will give some fence sitters the nudge that is needed. The SCOTUS decision does not directly apply to Seattle, but it does to Chicago, and you can bet gun rights supporters will begin to challenge a number of restrictive gun laws.
RCW's give the State the ultimate power to make law in WA regarding firearms. 9.41.290 Cities can't be more strict, especially where it concerns the right to self defense.
RCW 9.41.300 says cities can regulate places gun can be shot, except that they cannot violate Article 1, section 24 of the WA State Constitution.
Article 1, section 24 states: The right of the individual citizen to bear arms in defense of himself, or the state, shall not be impaired, but nothing in this section shall be construed as authorizing individuals or corporations to organize, maintain or employ an armed body of men.
Seattle's law ban's folks with CWP/CPL's, pistols are almost exclusively carried, although there are a few AOW's out there that I know of.

Before you call it a sawed off shotgun, it isn't. Never had a stock, never was assembled as a shotgun. Classified as an "all other weapons" type of firearm. Fits under a wading jacket.
