Physical
The physical qualities of the Heckler & Koch HK 21. Information presented is strictly for general reference and should not be misconstrued as useful for hardware restoration or operation.
1,020 mm
40.16 in
O/A Length
450 mm
17.72 in
Barrel Length
16.09 lb
7.30 kg
Weight
Delayed Blowback; Selective Fire
Action
7.62x51mm NATO; 5.56x45mm NATO
Caliber(s)
Metal Link Belt; 10- or 20-round box magazine; 50-round drum
Feed
Hooded Front Post; Rear Rotary Diopter Drum
Sights