The proposed legislation seeks to enhance public safety in Washington by prohibiting the manufacture, importation, distribution, sale, and offering for sale of assault weapons. It provides a detailed definition of "assault weapon," specifying certain firearms and characteristics, such as detachable magazines and specific design features. The bill allows limited exemptions for licensed firearm manufacturers and dealers to sell to armed forces and law enforcement agencies for purposes outside the state. It also highlights the correlation between assault weapons and gun violence, referencing studies that show a higher likelihood of fatalities in mass shootings involving these firearms.

In addition to prohibiting assault weapons, the bill amends existing definitions in RCW 9.41.010, updating terms related to firearms, dealers, and ammunition feeding devices. It establishes penalties for violations, classifying them as gross misdemeanors, and declares that such violations are considered unfair or deceptive acts under the state's consumer protection laws. The legislation includes a severability clause to maintain the enforceability of remaining provisions if any part is invalidated. The act is deemed necessary for the immediate preservation of public safety and will take effect immediately upon passage.