58 people at the Route 91 Harvest Music Festival in Las Vegas, Nevada, on October 1, 2017. (13) A gas-operated semiautomatic rifle was the weapon of choice for Omar Mateen, who killed 49 people at the Pulse Nightclub in Orlando, Florida, on June 12, 2016. (14) Congress is developing legislation to provide behavioral detection training to those selling firearms. (15) Congress is developing legislation to provide funds for strengthening school security and physical security infrastructure. (16) Individuals adjudicated as posing a threat to themselves or others should not be permitted to purchase firearms. (17) A system of due process must be established to ensure that citizens are not deprived of their Second Amendment rights. (18) Americans have declining faith in the system of checks designed to preclude future sales of firearms to those who were clearly deemed a threat. 3. Moratorium on the transfer or receipt of an assault rifle (a) In general During the 60-day period that begins with the day after the date of the enactment of this Act, it shall be unlawful for any person to transfer or receive an assault rifle. (b) Definitions In this section: (1) Assault rifle The term assault rifle means a gas-operated semiautomatic firearm with a rifled bore. (2) Gas-operated The term gas-operated means, with respect to a firearm, that the firearm uses a portion of gas of a firing cartridge to extract the fired cartridge case and chamber the next round. (3) Semiautomatic The term semiautomatic means, with respect to a firearm, that the firearm is a repeating firearm that utilizes a portion of the energy of a firing cartridge to extract the fired cartridge case and chamber the next round, and that requires a separate pull of the trigger to fire each cartridge. (4) Rifled bore The term rifled bore means, with respect to a firearm, that the firearm is designed or made to spin a fired projectile. (5) Firearm The term firearm has the meaning given the term in section 921(a)(3) of title 18, United States Code. (c) Penalties