The second version of the Mosin–Nagant sniper rifle with PU optical sight, began production late in 1942. This rifle included a simpler scope design, which was incorporated from the short-lived SVT-40, and was far easier to mass-produce. To this day, it remains the most widely produced and longest serving sniper rifle in the world, and remained the Soviet Union's main sniper rifle until it was superseded in 1962 by the semi-automatic SVD Dragunov rifle.