PU-21
The PU-21 (Russian: ПУ-21 Пулемёт с унифицированной подачей) is a 5.45×39mm machine gun designed by V. M. Kalashnikov and M. E. Dragunov between 1972 and 1977. == History == Russian (at the time Soviet) military forces have not fielded a squad-level, intermediate caliber, belt-fed machine gun since the retirement of the RPD in the early 1960s.