Top Definition
Machinegun developed by Heckler & Koch. Variable clip amount. Chambered for 7.62x51mm NATO.

A replacement, among others, for the M60 machinegun. It is fast-firing & somewhat-accurate.
There is also the HK23, which is chambered for 5.56x45mm NATO, and also has a shorter barrel.
"The HK21 is my machinegun! ^-^ "
by Dave April 04, 2004
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