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Hi Bryan and welcome. Unfortunately, no Sir. Detachable Magazine and Threaded Barrel are a no go combination. 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. Cheers and stay safe! --- https://www.budsgunshop.com/feeds/state_reg/washington_restrictions.pdf