Some short knowledge about the VSS:
The Vintóvka Snáyperskaya Spetsiálnaya "Vintorez" is an marksman rifle that includes a built in suppressed barrel originating from the Soviet Union.
Still in service since 1987, The VSS Vintorez is chambered in 9x39mm with a fire rate of 800-900 rounds per minute and a muzzle velocity of 282-292 m/s.
It weighs approximately 2.6 kg (5.73 lb) and has an Warsaw Pact attachment rail for any Russian based sights.
It also includes compatibility for the AS VAL's 20 round box mag and full auto switch for emergencies.
https://www.youtube.com/watch?v=i_8gNk5-TgE