HK21E

HK21E

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