The bill establishes new state standards for the labeling of imitation firearms sold in Washington state, introducing the term "imitation firearm" to define any BB device, toy gun, or replica that closely resembles a real firearm, potentially misleading individuals. It clarifies that certain items, such as nonfiring collector's replicas and spot marker guns that expel larger projectiles, are excluded from this definition. The bill also includes several insertions to update definitions related to firearms, such as "BB device" and "large capacity magazine," while clarifying terms like "dealer" and "distribute." These changes aim to enhance the regulatory framework surrounding firearms and imitation firearms, ensuring clearer guidelines for manufacturers, retailers, and consumers.

Furthermore, the bill redefines various terms related to firearms, including "semiautomatic assault rifle" and "untraceable firearm," and introduces a new definition for "serious offense," which includes violent felonies and other serious crimes. It establishes penalties for manufacturers, importers, or distributors who do not comply with the new labeling standards, making it a misdemeanor to alter imitation firearms in a way that makes them resemble real firearms. Additionally, it mandates that imitation firearms manufactured after July 1, 2005, must carry a conspicuous advisory warning about the potential for confusion with real firearms and outlines civil fines for non-compliance, emphasizing the importance of clear identification to enhance public safety.