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The 9×21mm Gyurza is a Russian pistol cartridge developed by TsNIITochMash. It was designed to penetrate body armor, and is primarily chambered for the SR-2 Veresk submachine gun and the SR-1 Vektor pistol.
The bullet itself has a hard sub-caliber core contained inside an outer sleeve. The two components are separated from a polyethylene layer. This design makes the bullet effective against both unarmored and armoured targets. If the round hits an unarmored target, the core and the sleeve remain together, creating a wider wound in the target. If the round hits an armored target, the sleeve is stripped away from the core, leaving the core with much more penetration power as it strikes the armor.
- SP-10 (7N29) - Armor-piercing, hardened steel core variant.
- SP-11 (7N28) - Standard lead core FMJ.
- SP-12 - Expanding bullet with decreased ricochet.
- SO-13 (7BT3) - Tracer variant based on the SP-10.