  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 9mm parabellum cartridge (92g-sd) and the .40 s&w cartridge (96g-sd), framed with the addition of the tactical equipment rail, designed and manufactured by beretta. == history == first appearing in 2001, the beretta 92g-sd and 96g-sd models evolved from the 92g version which was designed specifically for the french "gendarmerie nationale" (french military designation of "pamas-g1" which was initially manufactured in italy by beretta with steel supplied by france, and subsequently manufactured under license from beretta in france by giat; 1987âpresent) and used also by the "armÃ©e de l'air" (french air force) and other law enforcement agencies. the 96g is the authorized service pistol of the florida highway patrol. production of the 92g-sd and 96g-sd ceased in 2005. == operation == upon discharge, the pressures created by the expanding gases actuates the slide-barrel assembly in the following manner: after traveling rearward a small distance, the locking block stops the rearward movement of the barrel and releases the slide, which continues its rearward movement. the slide then extracts and ejects the spent cartridge case while compressing the recoil spring (positioned horizontally, directly below the barrel between the parallel guides of the receiver), and simultaneously cocks the hammer. the magazine spring forces the next cartridge up into line. at the apex of the recoil stroke the recoil spring acts to reverse the direction of the slide, chambering a fresh cartridge. == specifications == similar to a beretta 92fs brigadier and fitted with its heavy, wide slide that had removable front and rear night sights. because of the heavier slide, the gunâs balance was enhanced and felt recoil was reduced, improving accuracy for follow-up shots. the trigger spring had bends on both ends, so if it broke in the field, it could be taken out, put it in "
9mm_Parabellum_firearms Beretta_pistols