Rejion reviews the Academy Airsoft Kar98k shell-ejecting airsoft rifle, focusing on enhancing its cartridge ejection. He covers the rifle's basic specifications, sling attachment, appearance, and performance, including checking the metal cartridge for the modified bullet and measuring velocity. Addressing the rifle's poor cartridge ejection, Rejion suggests improvements like piston aero, stock resonance, outer barrel fixation, and a bullet collection bridge. He concludes with a demonstration of the rifle's improved performance after these modifications.