Wash. Rev. Code § 9.41.220
All machine guns, bump-fire stocks, undetectable firearms, short-barreled shotguns, or short-barreled rifles, or any part designed and intended solely and exclusively for use in a machine gun, short-barreled shotgun, or short-barreled rifle, or in converting a weapon into a machine gun, short-barreled shotgun, or short-barreled rifle, illegally held or illegally possessed are hereby declared to be contraband, and it shall be the duty of all peace officers, and/or any officer or member of the armed forces of the United States or the state of Washington, to seize said machine gun, bump-fire stock, undetectable firearm, short-barreled shotgun, or short-barreled rifle, or parts thereof, wherever and whenever found.
RCW 9.41.220
Effective dates- 2018 c 7 : See note following RCW 9.41.010.
Finding-Intent-Severability-1994 sp.s. c 7: See notes following RCW 43.70.540.
Effective date-1994 sp.s. c 7 ss 401-410, 413-416, 418-437, and 439-460: See note following RCW 9.41.010.