Heckler & Koch HK21
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The HK21 is a German 7.62 mm general-purpose machine gun, developed in 1961 by small arms manufacturer Heckler & Koch and based on the G3 battle rifle. The weapon is in use with the armed forces of several Asian, African and Latin American... Wikipedia
Manufacturer: Heckler & Koch; Fábrica de Braço de Prata; SEDENA
Barrel length: HK21, HK21A1, HK11A1, HK11E, HK23E, HK13E: 450 mm (17.7 in); HK21E: 560 mm (22.0 in); HK25: 900 mm (35.4 in)
Cartridge: HK21, HK21A1, HK11A1, HK21E, HK11E: 7.62×51mm NATO; HK23E, HK13E: 5.56×45mm NATO; HK25: 12.7×99mm NATO
Effective firing range: 100–1,200 m (109–1,312 yd) sight adjustments
In service: 1961–present
Place of origin: West Germany