| Type | General purpose machine gun |
|---|
| Place of origin |  West Germany |
| Service history |
| Used by | See Users |
| Production history |
| Designer | Heckler & Koch |
| Designed | 1961 |
| Manufacturer | Heckler & Koch |
| Variants | See Variants |
| Specifications |
| Weight | HK21: 7.92 kg (17.46 lb)
HK21A1: 8.30 kg (18.3 lb)
HK11A1: 7.70 kg (17.0 lb)
HK21E: 9.30 kg (20.5 lb)
HK11E: 8.15 kg (18.0 lb)
HK23E: 8.75 kg (19.3 lb)
HK13E: 8.00 kg (17.6 lb) |
| Length | HK21: 1,021 mm (40.2 in)
HK21A1, HK11A1, HK11E, HK23E, HK13E: 1,030 mm (40.6 in)
HK21E: 1,140 mm (44.9 in) |
| Barrel length | HK21, HK21A1, HK11A1, HK11E, HK23E, HK13E: 450 mm (17.7 in)
HK21E: 560 mm (22.0 in) |
|
| Cartridge | HK21, HK21A1, HK11A1, HK21E, HK11E: 7.62x51mm NATO
HK23E, HK13E: 5.56x45mm NATO |
| Action | Roller-delayed blowback |
| Rate of fire | HK21, HK21A1: 900 rounds/min
HK11A1, HK21E, HK11E: 800 rounds/min
HK23E, HK13E: 750 rounds/min |
| Muzzle velocity | HK21, HK21A1, HK11A1, HK11E: 800 m/s (2,625 ft/s)
HK21E: 840 m/s (2,755.9 ft/s)
HK23E, HK13E: 910 m/s (2,985.6 ft/s) (using the SS109 cartridge) |
| Effective range | 100–1,200 m sight adjustments |
| Feed system | M13, DM6, DM1 ammunition belt, 20-round detachable box magazine (from the G3) or 50-round drum |
| Sights | Rear rotary diopter drum; hooded front post |
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