The Beretta 92G-SD and 96G-SD Special Duty handguns are semi-automatic, locked-breech delayed recoil-operated, double/single-action pistols, fitted with the heavy, wide Brigadier slide, chambered for the 9×19mm Parabellum cartridge and the .40 S&W cartridge, framed with the addition of the tactical equipment rail, designed and manufactured by Beretta. Wikipedia