Hi Angel, Prohibited - A semiautomatic pistol that has the capacity to accept a detachable magazine and has one or more of the following:
A. A threaded barrel, capable of accepting a flash suppressor, forward handgrip, or silencer;
B. A second hand grip;
C. A shroud that encircles either all or part of the barrel designed to shield the bearer's hand from heat, except a solid forearm of a stock that covers only the bottom of the barrel; or
D. The capacity to accept a detachable magazine at some location outside of the pistol grip;
.
Magazines are limited to ten (10) rounds.
.
Details here budsgunshop.com/feeds/state_reg/washington_restrictions.pdf ,
.
Stay safe & have a great day!

Good evening to you!! Please see below link for more information. Hope this helps. Have a good rest of your day.
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budsgunshop.com/feeds/state_reg/washington_restrictions.pdf

Magazines are limited to ten (10) rounds. To purchase a handgun in the state of Washington, a person must be minimum age 21, a
resident of the state, and must possess a valid concealed pistol license. Additionally, the
transferring dealer must be notified in writing by the chief of police or sheriff of a jurisdiction in
which the purchaser resides that the purchaser is eligible to possess a pistol under RCW
9.41.040. To be sure, I would talk to a local FFL.