This bill, known as the "Less Than Lethal Act," aims to modernize the regulation of less-than-lethal weapons by amending the Internal Revenue Code of 1986. It primarily exempts certain less-than-lethal projectile devices and their associated shells or cartridges from the federal firearms and ammunition excise tax imposed by Section 4181. To qualify, a device must not be designed to expel common handgun, rifle, or shotgun ammunition, nor any projectile exceeding 500 feet per second, and must be intended for use in a manner not likely to cause death or serious bodily injury. Additionally, it cannot accept ammunition feeding devices commonly used in semiautomatic firearms or loaded through the inside of a pistol grip. Beyond tax exemptions, the legislation also removes these specifically defined less-than-lethal projectile devices from the purview of the National Firearms Act . Manufacturers, producers, or importers can request a classification determination from the Secretary, who must respond within 90 days. The Secretary is mandated to annually publish a public list of approved less-than-lethal devices and a separate list of devices that exceed the 500 feet per second velocity limit but are otherwise less-than-lethal, submitting a detailed report on the latter to Congress.