This is a bit involved.
First swing on over to these guys and buy the "deal of the day". I don't know if that means it's only for today.
https://www.righttobear.com/grid-defens ... -gdcp-blk/That legal serialized 100% frame is going to cost you $78 shipped to your FFL in WA state.
Now check out my post in this forum from last week and go buy the completion kit using the code: dark
That's going to cost you $240 complete shipped to your door.
I believe that will give you everthing you need except a mag.
I'm not positive righttobear.com ships to WA state so I'd do that first. JSD supply does for sure.