A-91
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The A-91 is a bullpup assault rifle developed during the 1990s by KBP Instrument Design Bureau in Tula, Soviet Union as an offspring of the 9A-91 firearm family. Wikipedia
Action: Gas-operated, rotating bolt
Barrel length: 415 mm (16.3 in)
Caliber: 7.62×39mm, 5.45×39mm, 5.56×45mm NATO
In service: 1990–present
Muzzle velocity: 715 (А-91), 910 (5,56А-91)
Rate of fire: 600–800 rounds/min; 700 rounds/min (5,56A-91)
Used by: Russian Police, Military Services