Engrossed Substitute House Bill 2320 reenacts and amends RCW 9.41.010 and amends RCW 9.41.190, 9.41.325, 9.41.326, and 9.41.327, creates at least one new section, declares an emergency, and staggers effective dates: Section 2 expires June 30, 2027; Section 3 takes effect June 30, 2027; the remainder of the act (except section 3) takes effect immediately. The bill adds and revises many definitions used throughout the chapter, including detailed definitions for "assault weapon," "digital firearm manufacturing code," "untraceable firearm" (firearms manufactured after July 1, 2019 that cannot be traced by a federally affixed serial number), "undetectable firearm," "unfinished frame or receiver," "large capacity magazine," and others. Substantively, the bill creates and clarifies criminal and civil prohibitions and penalties related to manufacturing, assembling, distributing, possessing, transporting, or receiving certain weapons and weapon parts by means that include three-dimensional printers or CNC milling machines and by use or distribution of digital firearm manufacturing code. It makes it unlawful to manufacture, own, sell, assemble, repair, or possess machine guns, bump‑fire stocks, undetectable firearms, short‑barreled shotguns and rifles, untraceable firearms, and unfinished frames or receivers except in specified limited circumstances (for example, compliance with federal law, certain law enforcement or federal licensees, marking/imprinting exceptions). The bill also restricts distribution and possession of digital firearm manufacturing code to federal firearms manufacturers or certain federally licensed dealers, establishes that failure to perform a required background check is prima facie evidence of recklessness in related offenses, treats each firearm or frame/receiver as a separate violation, and sets a tiered penalty scheme ranging from a $500 civil infraction for some first violations up through misdemeanors, gross misdemeanors, and class C felonies depending on the offense and prior violations. Legally, this is a mix of statutory reenactment and amendment, new definitions, new and amended criminal offenses and civil penalties, and procedural evidentiary change (the background check presumption). The bill also defines "serious offense" to include various violent and sexual crimes for statutory purposes. The provided extracts are incomplete in places: the full definition of "felony firearm offender" is cut off, some penalty paragraphs and the opening language for certain sections are truncated, and not all specific effective or expiration dates and some cross-referenced provisions appear in the excerpts, so the complete scope and certain implementation details cannot be confirmed from the material provided.

If enacted, the bill would sharply limit the ability of private individuals and hobbyists to make, possess, sell, or share plans for firearms produced with 3D printers or CNC machines and would ban untraceable or undetectable guns and unfinished frames or receivers unless they are handled by law enforcement or federally licensed manufacturers or dealers (with narrow exceptions for repair or properly serialized items). People who distribute digital files that can be used to print or mill guns, or who help others manufacture such weapons, would face a $500 civil fine for first offenses that can escalate to criminal charges on repeat or knowing violations, and each firearm or unfinished receiver can be treated as a separate offense; failing to run required background checks is treated as evidence of recklessness in these cases. The most affected are DIY builders, sellers of so-called “80 percent” frames or digital files, and anyone without federal licensing who trades in unfinished receivers or untraceable firearms—they would lose those options and face greater legal and financial risk. Law enforcement, military, and federally licensed manufacturers and dealers retain limited exemptions, but the text leaves some key details unclear (some definitions, the full penalty scheme, and parts of the amended sections are truncated), and the bill phases and timing add complexity: most provisions take effect immediately, section 3 takes effect June 30, 2027, and section 2 expires June 30, 2027.