Washington Revised Code Title 9. Crimes and Punishments § 9.41.190. Unlawful firearms--Exceptions

(a) Manufacture, own, buy, sell, loan, furnish, transport, or have in possession or under control, any machine gun, bump-fire stock, undetectable firearm, short-barreled shotgun, or short-barreled rifle;

(b) Manufacture, own, buy, sell, loan, furnish, transport, or have in possession or under control, any part designed and intended solely and exclusively for use in a machine gun, bump-fire stock, undetectable firearm, short-barreled shotgun, or short-barreled rifle, or in converting a weapon into a machine gun, short-barreled shotgun, or short-barreled rifle;

(c) Assemble or repair any machine gun, bump-fire stock, undetectable firearm, short-barreled shotgun, or short-barreled rifle; or

(d) Manufacture, cause to be manufactured, assemble, or cause to be assembled, an untraceable firearm with the intent to sell the untraceable firearm.

(a) Any peace officer in the discharge of official duty or traveling to or from official duty, or to any officer or member of the armed forces of the United States or the state of Washington in the discharge of official duty or traveling to or from official duty; or

(b) A person, including an employee of such person if the employee has undergone fingerprinting and a background check, who or which is exempt from or licensed under federal law, and engaged in the production, manufacture, repair, or testing of machine guns, bump-fire stocks, short-barreled shotguns, or short-barreled rifles: