Personal defense weapon
|Place of origin||Russia|
|Mass||1.65 kg (3.6 lb)|
|Length||603 mm (23.7 in) stock extended|
367 mm (14.4 in) stock folded
|Barrel length||174 mm (6.9 in)|
|Action||Gas-operated, rotating bolt|
|Rate of fire||900 rounds/min|
|Muzzle velocity||415–430 m/s (1,360–1,410 ft/s)|
|Effective firing range||200 m (660 ft)|
|Feed system||20- or 30-round detachable box magazine|
|Sights||KP SR-2 reflex sight (red-dot sight)|
Development of a new submachine gun chambered for the 9×21mm Gyurza cartridge (also used by the SR-1 "Vektor" pistol) was launched in the mid-1990s on the request of Russia's Federal Security Service (FSB). A weapon was presented in 1999, developed by TsNIITochMash in Klimovsk, which received the designation of SR-2 (Russian: Специальная Разработка 2, translit. Spetsial′naya Razrabotka 2, English: Special Development 2) and nicknamed "Veresk" ("Heather").
"Veresk" and its round were created as a compact weapon capable of engaging enemies wearing Russian class-II body armor (able to stop ordinary pistol bullets, such as 9×19mm Parabellum and 7.62×25mm Tokarev), and soft-skinned vehicles, at distances up to 200 metres.
The SR-2 "Veresk" differs from most submachine guns by its gas-operated action with rotating bolt, typically used in assault rifles (normally SMGs utilise different blowback principles). This design is partially borrowed from the SR-3 "Vikhr" compact assault rifle. Externally the "Veresk" is similar to the Uzi; 20- or 30-round magazines are inserted into the pistol grip. There are two AK-style control levers on both sides of the receiver: the right one is the safety switch, the left is a fire-mode selector. The cocking handle is on the right side and is fixed to the bolt carrier, so it moves during firing. There is a mount for a "red dot" sight on top of the receiver (unlike the AK-style side rail). The weapon has an upwards-folding metal stock.
An SR-2M modified version also has a forward pistol grip under the handguard, with a protrusion to protect the shooter's hand from muzzle blast and accidents (similar to the grip on the MP5K). The SR-2M stock can be fully folded even with "red dot" sight installed.
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