No SBR/SBS in WA? I'm not too sure on that one.
I know that any full auto is verboten--no one can own one, not even cops. I also know that you can own suppressors--but you can't put them on a firearm. (Insert serious "***?!?" moment here.)
But to the best of my knowledge, SBR's and SBS are not restricted, beyond the usual plethora of Federal law.
If someone who is well versed on WA State firearms law can comment further, I would welcome it.
EDIT: Never mind, it was right in front of me. Here it is:
"(1) It is unlawful for any person to manufacture, own, buy, sell, loan, furnish, transport, or have in possession or under control, any machine gun, short-barreled shotgun, or short-barreled rifle; 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; or to assemble or repair any machine gun, short-barreled shotgun, or short-barreled rifle.
(2) This section shall not apply to:
(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, short-barreled shotguns, or short-barreled rifles:
(i) To be used or purchased by the armed forces of the United States;
(ii) To be used or purchased by federal, state, county, or municipal law enforcement agencies; or
(iii) For exportation in compliance with all applicable federal laws and regulations.
(3) It shall be an affirmative defense to a prosecution brought under this section that the machine gun, short-barreled shotgun, or short-barreled rifle was acquired prior to July 1, 1994, and is possessed in compliance with federal law.
(4) Any person violating this section is guilty of a class C felony."
I guess the only sunshine in this is Section 3. That sucks.