No, the Smith & Wesson M&P FPC 10mm rifle is likely not legal to sell or purchase in Washington State due to its features that classify it as an "assault weapon" under the state's regulations. Washington law prohibits the sale, manufacture, and import of assault weapons, effective April 25, 2023. The ban applies to semiautomatic rifles with a detachable magazine and a threaded barrel.
Factors contributing to its illegality in WA:
Detachable Magazine:
The FPC 10mm is a pistol carbine that can accommodate a magazine capable of holding more than 10 rounds, which is a characteristic of assault weapons under Washington law.
Threaded Barrel:
The FPC 10mm is designed to accept a suppressor, which is a feature often associated with assault weapons and is a key characteristic of the ban.