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 legislation establishes a framework for the Attorney General to maintain a publicly accessible list of prohibited firearms and outlines exceptions for government agencies and licensed dealers. It also includes a certification process for existing firearms, which must be adhered to by owners, and sets a compliance deadline of July 1, 2025, for possession and transfer of firearms manufactured before this date.

Additionally, the act introduces new regulations for licensed firearm dealers, requiring them to provide certification forms for law enforcement inspections and to submit these forms to the Attorney General if they cease operations. It establishes a rebuttable presumption of entitlement to possess and transport firearms based on the submitted certification. The bill also addresses regulations for nonresidents transporting firearms, classifying violations as misdemeanors, while felonies committed with regulated firearms are categorized as fourth-degree felonies. A severability clause is included to ensure the act's enforceability even if parts are deemed invalid.