The VSSK Vykhlop (Vintovka Snayperskaya Spetsial'naya Krupnokalibernaya, Винтовка Снайперская Специальная Крупнокалиберная, "Special high-caliber sniper rifle", Vykhlop is Russian for "exhaust"), also known as the VSSK Vychlop or the VKS, is a Russian sniper rifle.
The weapon was first designed in 2002 as a sniper rifle made for silent firing and penetration power much greater than that of the VSS Vintorez. It is currently being used by the FSB and other Russian special forces.
The VKS is a straight-pull bolt-action sniper rifle with an integrated suppressor. It has an accuracy claim of one minute of arc at a range of 100 meters (328.1 feet) with precision bullets.