Ischmasch
It was developed in 1957–1963 and selected as the winner of a contest that included three competing groups of designers, led by Sergei Simonov, Aleksandr Konstantinov and Yevgeny Dragunov. Extensive field testing of the rifles conducted in a wide range of environmental conditions resulted in Dragunov's proposal being accepted into service in July 1963. An initial pre-production batch consisting of 200 rifles was assembled for evaluation purposes, and from 1964 serial production was carried out by Izhmash, later called Kalashnikov Concern.