 9×21mm Gyurza

The 9×21mm "Gyurza" ("Гюрза", Russian for "blunt-nosed viper") round is a Russian handgun round designed to defeat body armor that was developed by TsNIITochMash for its SR-1 Vektor semi-automatic pistol and SR-2 Veresk submachine gun.The method of construction of the rounds allows them to be effective against both unarmored and armored targets.