This anti-riot weapon is a non-lethal rifled gun firing 37x112mmRs grenades, containing CS gas, fed from a five-round open-sided spring-driven cylinder. It is capable of sustained fire of 12 rpm, with an average muzzle velocity of 76 mps..
—Syphon Filter 2 Weaponry Screen Description
Syphon Filter 2
In Syphon Filter 2, Lian Xing must use a tear gas launcher to incapacitate people without killing them on two separate occasions: in the Moscow Streets to get past police officers in pursuit of Gregorov, and during the Aljir Prison Escape, when two female prisoners refuse to let Lian and Gregorov leave.
Despite its low ammo count, the Tear Gas Launcher is a necessary weapon in the game, able to non-lethally take down many enemies at a time. It would be borderline overpowered if found elsewhere.