The SR-1 Vektor, also called the Gyurza, was developed by TsNIITochMash for Russian special operations units requiring armor-piercing capability beyond the standard 9mm. The 9x21mm SP-10 cartridge can defeat Level III body armor at combat distances. Issued to FSB and SVR special units, it remains a highly classified and rarely seen service weapon. Type: Pistol Action: Semi-Automatic Caliber: 9x21mm SP-10 Capacity: 18 Year introduced: 1996, Russia Weight: 35.6 oz Overall length: 8.26" Status: Active Military use: Yes Intended use: Military, Special Operations