I urge you contact your legislators because the magazine ban that did not get voted on this session (narrowly) WILL be back this January.
To make matters worse, even though they didn't get floor votes this past session they can skip the committee process again and go to vote, which the Speaker has promised as a priority.

See article here:
https://komonews.com/news/local/latest-mass-shootings-renew-effort-to-ban-high-capacity-ammunition-magazines?fbclid=IwAR18tswwwur2APn-jx_Ofg2fyPGNLi55mVYPQUvKmtuplSFEcnVUH3zf20o

Links to the Bills (House and Senate) are available here:
https://legiscan.com/WA/bill/HB1068/2019

This ban allows magazine usage on physical property (with permission) and at the range!

To get them to those locations you must carry them UNLOADED and separate.

THERE IS NO EXEMPTION FOR CCW!

There are a lot of firearms do not have 10 round variants, especially those that are out-of-production. This will essentially take those pistols out of LEGAL usage for CCW - by people ALREADY LEGALLY LICENSED to carry a pistol.
Of course, the concept of limiting to 10 is ridiculous itself. 10 is good but 15 is not? 2 x 10rd mags is 20. In the 10 years of the Federal "Assault Weapons Ban" did high-capacity mags disappear? I'll grant you that their prices sure did jump up, but they were far from gone.

Please remain vigilant and contact your legislators.

We know from other States' experience (CA, NY, etc) that first they grand-fathered, then registered, and then outright possession banned. The "nobody is coming for your guns" (and magazines and ammo) is simply not true. One only has to watch the POTUS debates to  see that.