The HK21 is a West German 7.62×51mm NATO belt-fed general-purpose machine gun, developed in 1961 by Heckler & Koch. Its design is based on the G3 platform, the closed bolt roller-delayed blowback. The weapon is in use with the armed forces of several Asian, African and Latin American countries.
The HK21 also accepts 20-round detachable ammunition box or 50-round drum magazine. An 80-round and 100-round drum magazine was also available (no longer manufactured).
