
1) Series of light machine-guns
Found on
https://www.crosswordclues.com/clue/rpk

The RPK (Ruchnoy Pulemyot Kalashnikova, Ручной пулемёт Калашникова or `Kalashnikov hand-held machine gun`) is a 7.62x39mm light machine gun of Soviet design, developed by Mikhail Kalashnikov in the late 1950s, parallel with the AKM assault rifle. It was created as part of a program designed to standardize the small arms i.....
Found on
http://en.wikipedia.org/wiki/RPK

Series of light machine-guns [VARIOUS]
Found on
https://www.encyclo.co.uk/local/20785
No exact match found.