Currently the bill has not yet been scheduled for a Senate floor vote.
A few years ago, WA changed the legal definition of semi auto rifles to "semiautomatic assault rifles". EVERY SINGLE ONE. Not just military look alikes (AR AK, etc) but every single semi auto rifle, no matter what caliber, how old, fixed magazine or detachable, ALL are now legally defined as semiautomatic assault rifles.
Buying one now requires a 10 day waiting period, a special safety class, and approval of local law enforcement agency. ALSO included in that law are requirements that your personal medical records must be given to the LEO agency so they can determine your "fitness" to posess such a weapon.
Then a couple years after that the passed a law banning "manufacture, sale, transfer" (etc) of magazines holding over 15 rounds. You can keep what you had, but can't buy any more, or sell (or give) what you have to anyone in the state.
I recently sold a semi auto rifle out of state (via FFL dealer), because while I could have legally sold the rifle in state, I couldn't legally sell the rifle's magazine in WA! (nobody will pay much for a semi with no magazine)
NOW, the proposed law would ban the sale of assault WEAPONS which is not only semi auto rifles, but also pistols and shotguns, that meet the definitions specified in the bill.
I don't believe these people are not going to be satisfied stopping there, either. AR pistols, AS PISTOLS would be eliminated, forget all the Fed crap about braces, the pistol with no "brace" at all would be gone.
Local gunshop (who does focus on the "Tactical" market) is doing $20-25K business DAILY right now. And, no, they don't have any AR pistols on the shelf, either.
Everytime they get one, somebody buys it...