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LOL, Jerry can beat that with a revolver...
at the rate of five or more shots per second.
...
My understanding is no, not legal.
You can argue it is a "press" gun goes bang and a "release" gun goes bang.
But that arguement may cost you your freedom and easily $100,000 inlegal bills to be the guinea pig.
I would donate some to help out a person.
Agreed, but even that argument wouldn't get far anyway since it's only the federal pre-bumpstock definition that specifies multiple automatic shots "per operation of the trigger". The WA definition for machine gun includes (emphasis mine) "any other mechanism or instrument not requiring that the trigger be pressed for each shot".
Binary triggers seem to fit that definition rather specifically. The law is certainly an infringement, but as MM says you'd potentially end up having to give up a lot to fight it in court.
There is a "catch all" in the RCW which (I paraphrase) says that anything that enables the firing of 5 or more rounds per second is illegal. It's a pretty nebulous definition because maybe I fire more slowly than you. It needs to be challenged and hopefully will be.