SUBSTITUTE SENATE BILL 5444
http://lawfilesext.leg.wa.gov/biennium/2017-18/Pdf/Bills/Senate%20Bills/5444-S.pdf(29) "Assault weapon" means:
p. 5 SSB 5444
1 (a) A semiautomatic rifle that has the capacity to accept a
2 detachable magazine and has one or more of the following:
3 (i) A pistol grip that protrudes conspicuously beneath the action
4 of the weapon;
5 (ii) A thumbhole stock;
6 (iii) A folding or telescoping stock;
7 (iv) A second handgrip or a protruding grip that can be held by
8 the nontrigger hand;
9 (v) A flash suppressor, muzzle break, muzzle compensator, or
10 threaded barrel designed to accommodate a flash suppressor, muzzle
11 break, or muzzle compensator;
12 (vi) A grenade launcher or flare launcher;
13 (b) A semiautomatic pistol, or a semiautomatic, centerfire, or
14 rimfire rifle with a fixed magazine, that has the capacity to accept
15 more than ten rounds of ammunition;
16 (c) A semiautomatic pistol that has the capacity to accept a
17 detachable magazine and has one or more of the following:
18 (i) Any feature capable of functioning as a protruding grip that
19 can be held by the nontrigger hand;
20 (ii) A threaded barrel, capable of accepting a flash suppressor,
21 forward handgrip, or silencer;
22 (iii) A shroud attached to the barrel, or that partially or
23 completely encircles the barrel, allowing the bearer to hold the
24 firearm with the nontrigger hand without being burned, but excluding
25 a slide that encloses the barrel; or
26 (iv) The capacity to accept a detachable magazine at any location
27 outside of the pistol grip;
28 (d) A semiautomatic, centerfire, or rimfire rifle that has an
29 overall length of less than thirty inches;
30 (e) A semiautomatic shotgun that has both of the following:
31 (i) A pistol grip that protrudes conspicuously beneath the action
32 of the weapon, thumbhole stock, or vertical handgrip;
33 (ii) A folding or telescoping stock; or
34 (iii) An ability to accept a detachable magazine;
35 (f) A shotgun with a revolving cylinder; or
36 (g) A conversion kit, part, or combination of parts, from which
37 an assault weapon can be assembled if those parts are in the
38 possession or under the control of the same person.
p. 6 SSB 5444
1 "Assault weapon" does not include antique firearms, any firearm
2 that has been made permanently inoperable, or any firearm that is
3 manually operated by bolt, pump, lever, or slide action.
4 (30) "Detachable magazine" means an ammunition feeding device
5 that can be loaded or unloaded while detached from a firearm and
6 readily inserted into a firearm.