9×21mm
The 9×21mm pistol cartridge (also known as the 9×21mm GP, 9×21mm IMI, 9mm IMI, 9x21mm Italian, or 9mm Italian) was designed by Jager (Loano, Italy), then adopted and commercialised by Israel Military Industries for those jurisdictions where military service cartridges, like the 9×19mm Parabellum, are or were illegal for civilian purchase (i.e. Italy, France, Brazil, and Mexico).
| 9×21mm | ||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
9×21mm (left) and parent 9×19mm Parabellum (right) cartridges | ||||||||||||
| Type | Pistol | |||||||||||
| Place of origin | Italy Israel | |||||||||||
| Production history | ||||||||||||
| Designer | Franco Benvenuti Agency (Italy) and Israel Military Industries (IMI) | |||||||||||
| Produced | 1980–present | |||||||||||
| Specifications | ||||||||||||
| Parent case | 9×19mm Parabellum | |||||||||||
| Case type | Rimless, straight | |||||||||||
| Bullet diameter | 9.03 mm (0.356 in) | |||||||||||
| Land diameter | 8.79 mm (0.346 in) | |||||||||||
| Neck diameter | 9.63 mm (0.379 in) | |||||||||||
| Base diameter | 9.93 mm (0.391 in) | |||||||||||
| Rim diameter | 9.96 mm (0.392 in) | |||||||||||
| Rim thickness | 1.27 mm (0.050 in) | |||||||||||
| Case length | 21.15 mm (0.833 in) | |||||||||||
| Overall length | 29.75 mm (1.171 in) | |||||||||||
| Case capacity | 1.01 cm3 (15.6 gr H2O) | |||||||||||
| Rifling twist | 254 mm (1 in 10 in) | |||||||||||
| Primer type | Small pistol | |||||||||||
| Maximum pressure | 235.00 MPa (34,084 psi) | |||||||||||
| Ballistic performance | ||||||||||||
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| Source(s): C.I.P. | ||||||||||||
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