The NSV (Russian НСВ Никитина-Соколова-Волкова) is a 12.7 mm caliber heavy machine gun of Soviet origin, named after the designers, G. I. Nikitin (Г. И. Никитин), Y. S. Sokolov (Ю. М. Соколов) and V. I. Volkov (В. И. Волков). It was designed to replace the DShK machine gun and was adopted by the Soviet Army in 1971. It is no longer being manufactured in Russia; the manufacturing license for the NSV ended up in Kazakhstan after the break-up of the Soviet Union, but the new Kord machine gun has been developed instead and is used to replace worn-out units. The NSV has been manufactured in Bulgaria, India, Poland and Yugoslavia under license.
The NSV weighs 25 kg, has a rate of fire of 13 rounds per second, and an effective range of 1,500 meters. A fully loaded ammunition belt with 50 rounds weighs 11 kg.
The NSVT version is used on the T-72, T-64 and T-80 tanks.