; (2) require that each licensed dealer record purchaser acknowledgment of the list published under subsection (a) before any sale of a firearm that is not prohibited under that list; (3) before removing any gas-operated semi-automatic firearm from the list required under subsection (a), submit to the Attorney General clear and convincing evidence of whether the firearm should be removed from the list; and (4) advise the Attorney General on carrying out the authority described in subsection (a). (c) Applications for approval of firearm designs (1) In general Any semi-automatic firearm designed on or after the date of enactment of this section shall be required to have an approval under this subsection prior to the manufacture, in or affecting interstate or foreign commerce, of such firearm for sale to civilians. (2) Application for approval A licensed manufacturer may file with the Attorney General an application, under penalty of perjury, for approval for a semi-automatic firearm as not subject to the prohibition under section 922(v), which shall contain— (A) a detailed description of the specifications and operation of the firearm; (B) a physical sample of the firearm; (C) any patent application for the firearm; (D) marketing materials and plans; (E) an explanation of why the firearm should not be subject to the prohibition under section 922(v); (F) a description of any features that prevent modification of the firearm