The PSO-1 (Прицел Снайперский Оптический, Pritsel Snaipersky Optichesky, "Optical Sniper Sight") is a 4×24 telescopic sight manufactured in Russia by the Novosibirsk instrument-making factory (NPZ Optics State Plant) and issued with the Russian military Dragunov sniper rifle. It was introduced on 3 July 1963 together with the Dragunov sniper rifle.
"A 4x magnification scope for medium range engagements."
— In-game description
The 4x PSO-1 is optical sight featured in Insurgency: Sandstorm. It can be use only on SVD and AS VAL