Mil-Spec construction – the only pump action shotgun to pass MilSpec 3443E; Metal trigger guard and safety buttons; 590A1 models offer a variety of sighting options to meet mission-specific needs: LPA brand ghost ring sights, high-visibility 3-dot (bottom) or front bead configurations; The Plus 4 shell storage stock holds an additional four shotshells keeping you prepared during unexpected emergencies; M-Lok forend