IP-2
The PU-21 (Russian: ПУ-21 Пулемёт с унифицированной подачей) is a 5.45x39mm machine gun designed by V. M. Kalashnikov and M. E. Dragunov between 1972 and 1977. The PU-21 can be fed from either a 45-round magazine or a 200-round belt. The PU-21's sights are graduated to distance of . The PU-21 prototypes were thoroughly tested by the Soviet Army in Leningrad, but military experts did not see convincing arguments for replacing the RPK and RPK-74 with the PU-21 design. According to the Soviet military, the design was too complex compared to other weapons then in service, and failed to enhance combat effectiveness. See also
List of machine guns
List of dual-feed firearms
Ares Shrike 5.56
RPK-74
RPL-20, a similarly belted 5.45 machine gun, drew some inspiration from this project
PKM
FN Minimi
List of Russian weaponry

References

5.45×39mm machine guns
Cold War firearms of the Soviet Union
Machine guns of the Soviet Union
TsNIITochMash products
Light machine guns