The Gas-Operated Semiautomatic Firearms Exclusion Act seeks to prohibit the importation, sale, manufacture, transfer, receipt, or possession of gas-operated semiautomatic firearms, along with large-capacity ammunition feeding devices and rapid fire devices. The act empowers the Attorney General to create and maintain a list of prohibited firearms, which will be publicly accessible online. It includes exceptions for certain entities, such as government agencies and licensed dealers, and establishes a certification process for firearms manufactured before the act's effective date of July 1, 2025. The act also categorizes violations related to machine guns and rapid fire devices as fourth-degree felonies and mandates that licensed dealers mark all newly imported or manufactured firearms after January 1, 2026.

Additionally, the act introduces new provisions for the regulation of gas-operated semiautomatic firearms, including requirements for licensed dealers to provide certification forms for law enforcement inspections and to submit these forms to the Attorney General if they cease operations. The certification must confirm lawful possession and include specific details about the firearm and owner, while also ensuring confidentiality. The bill outlines regulations for nonresidents transporting firearms, requiring them to submit a certification within sixty days of moving into the state. Violations are classified as misdemeanors, with felony offenses while in possession of a regulated firearm categorized as fourth-degree felonies. A severability clause is included to maintain the enforceability of remaining provisions if any part of the act is found invalid.