9×21mm


The 9×21mm pistol cartridge was designed by Jager, then adopted and commercialised by Israel Military Industries for those markets where military service cartridges, like the 9×19mm Parabellum, are banned by law for civilian use.

History

Based on the 9×19mm Parabellum cartridge, the case was lengthened from. The bullet sits slightly deeper in the case, which results in almost the same overall length as the 9×19mm Parabellum cartridge.
The cartridge was designed by Mr. Giordano & Mr. Piscetta to be used for civil purposes with large pistols. It was named 9 mm GP. The users were not enthusiastic at the very beginning for several reasons, such as the fact that barrels had to be modified.
During the '80's, the cartridge became the perfect caliber to be used for all those automatic pistols designed for military cartridges all over the world that are frequently forbidden for civilian uses; for this reason Israel Military Industries started to use 9x21mm. During that period IMI got permission to import the UZI Defender into Italy chambered for 9x21 IMI. It was the first official commercial launch for the 9x21mm. From that period on several companies in Italy started to sell 9x21mm pistols and ammunition. In just a few decades, the 9x21mm GP or 9x21 IMI became roughly 80% of the civilian small arms market in Italy.

Synonyms

The 9×21mm has 1.01 ml cartridge case capacity.
9×21mm maximum C.I.P. cartridge dimensions. All sizes in millimeters.
The common rifling twist rate for this cartridge is 254 mm, 4 grooves, Ø lands = 8.79 mm, Ø grooves = 9.03 mm, land width = 3.80 mm and the primer type is small pistol.
According to the official C.I.P. guidelines, the 9×21mm case can handle up to piezo pressure. In C.I.P. regulated countries every pistol cartridge combo has to be proofed at 130% of this maximum C.I.P. pressure to certify for sale to consumers.