(b) "Firearm industry product" means a product that meets any of the following conditions:
(i) The firearm industry product was sold, made, distributed, or marketed in this state;
....
(e) "Product" means:
(i) A firearm;
(ii) Ammunition;
...
f) "Reasonable controls" means reasonable procedures, safeguards, and business practices, including but not limited to screening, security, and inventory practices, that are designed and implemented to do all of the following:
(i) Prevent the sale or distribution of a firearm industry product to a straw purchaser, a firearm trafficker, a person prohibited from possessing a firearm under state or federal law, or a person who the firearm industry member has reasonable cause to believe is at substantial risk of using a firearm industry product to harm themselves or unlawfully harm another, or of unlawfully possessing or using a firearm industry product;
...
(4) A firearm industry member shall establish, implement, and enforce reasonable controls regarding its manufacture, sale, distribution, importing, use, and marketing of firearm industry products
Note that this bans the sale of ammo to someone who is not allowed to own a firearm, and requires the seller to screen for this. How else would your screen than a NICS check?
Obviously this is some BS but it's why online ammo retailers and wholesalers are blacklisting WA