No, it is not.

It is not WA compliant.

orry Prohibited A semiautomatic shotgun that has any of the following:
A grip that is independent or detached from the stock that
protrudes conspicuously beneath the action of the weapon. The addition of a fin
attaching the grip to the stock does not exempt the grip if it otherwise resembles the grip
found on a pistol
;budsgunshop.com/feeds/state_reg/washington_restrictions.pdf

Hi Jaedonaius and welcome. No Sir, the Pistol Grip is restricted on a semi-auto shotgun. An option is budsgunshop.com/product_info.php/products_id/411561248/panzer+arms+m4+12ga+18.5+disruptive+grey+cerakote+walnut+stock+ambidextrous+5+1 ----------- Cheers and stay safe!

Hi Jaedonaius, unfortunately no, a semi-auto shotgun cannot have a pistol grip in the state of WA
budsgunshop.com/feeds/state_reg/washington_restrictions.pdf