Infantry Weapons

HK21 general-purpose machine gun

The HK21 is a Heckler & Koch belt-fed 7.62x51 mm NATO general-purpose machine gun derived from the G3 rifle family. In the Boko Haram Insurgency, Nigerian military reporting and ISWAP media analysis document HK21-pattern guns among weapons recovered from, or displayed by, Boko Haram and ISWAP forces, making it a small-unit fire-support weapon in the Lake Chad conflict archive.

Boko Haram InsurgencyBoko Haram and ISWAP

Conflict side: Boko Haram and ISWAP
Built by: Heckler & Koch
Built in: West GermanyGermany

HK21 general-purpose machine gun, 7.62 mm general-purpose machine gun, Infantry Weapons

Image source: File:HK 21 LMG RIGHT SIDE.jpg

Profile

Type: 7.62 mm general-purpose machine gun
Conflict side: Boko Haram and ISWAP
Origin: West Germany
Service note: Cold War design still appearing in contemporary conflicts

NATO machine gun belt-fed small arms portable

Service History

In service: Introduced in the 1960s and exported to multiple countries
Used by: Boko Haram and ISWAP
Wars: Boko Haram Insurgency

Production History

Designer: Heckler & Koch
Designed: 1961
Built by: Heckler & Koch
Built in: West GermanyGermany
Produced: 1960s onward, including variants and licensed production
Variants: HK21, HK21A1, HK21E

Specifications

Caliber: 7.62x51 mm NATO
Operation: Roller-delayed blowback, selective fire
Feed: Belt feed using disintegrating M13 or DM6 links; some variants can use G3-pattern magazines or drums
Barrel: Quick-change barrel; HK21E examples used 22 in or 17.7 in barrels
Weight: HK21E about 20 lb unloaded with bipod and 22 in barrel; 19.40 lb with 17.7 in barrel
Mounting: Fired from bipod, tripod, shoulder, or vehicle mounts depending on configuration

Conflict Usage

Boko Haram Insurgency: Side: Boko Haram and ISWAPRole: Insurgent infantry fire supportstrike
Documented with Boko Haram and ISWAP forces through Nigerian military reporting on recovered HK21 guns and independent analysis of ISWAP media showing HK21 machine guns, with many such weapons assessed as stolen from Nigerian or Chadian forces.

HK21 general-purpose machine gun Images

HK21 general-purpose machine gun, 7.62 mm general-purpose machine gun, Infantry Weapons - view 1 — Source: File:HK 21 LMG RIGHT SIDE.jpg

HK21 general-purpose machine gun, 7.62 mm general-purpose machine gun, Infantry Weapons - view 2 — Source: File:HK 21 LMG Left and Right noBG.png

HK21 general-purpose machine gun, 7.62 mm general-purpose machine gun, Infantry Weapons - view 3 — Source: File:HK 21 LMG RIGHT SIDE.jpg

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Sources

Heckler & Koch's Modular Machine Gun: the HK21EPublisher: Forgotten Weapons | Note: Supports HK21/HK21E background, Heckler & Koch origin, 1961 design context, G3-family relationship, and export history. | Accessed: 2026-06-21 The HK21E Machine GunPublisher: Small Arms Review | Note: Supports HK21E specifications, including 7.62x51 mm NATO chambering, belt-fed configuration, bipod/tripod/shoulder use, barrel options, and unloaded weights. | Accessed: 2026-06-21 Troops neutralise Boko terrorists at Wurge in BornoPublisher: The Guardian Nigeria | Note: Boko Haram Insurgency: HK21 rifle was used by Boko Haram/ISWAP terrorists and abandoned during a 2020 encounter before being recovered by Nigerian troops. | Accessed: 2026-06-21 Nigerian troops eliminate 85 terrorists; 2,783 surrenderPublisher: P.M. News | Note: Boko Haram Insurgency: HK21 guns were used by Boko Haram/ISWAP forces and recovered by Nigerian troops during Operation Hadin Kai reporting for September 2021. | Accessed: 2026-06-21 Islamic State Province's Media in Africa: Comparing Trends in West and Central AfricaPublisher: Jamestown Foundation | Note: Boko Haram Insurgency: HK21 machine guns were used by ISWAP and appeared in ISWAP media, with the source assessing many weapons as stolen from Nigerian and Chadian armies. | Accessed: 2026-06-21 File:HK 21 LMG RIGHT SIDE.jpgPublisher: Wikimedia Commons | Note: Supports image provenance for the primary HK21A1 right-side view; Wikimedia Commons lists the Swedish Army Museum source and public-domain release. | Accessed: 2026-06-21 File:HK 21 LMG Left and Right noBG.pngPublisher: Wikimedia Commons | Note: Supports image provenance for a composite left-and-right HK21 view licensed under CC BY-SA 4.0. | Accessed: 2026-06-21 File:HK21.JPGPublisher: Wikimedia Commons | Note: Supports image provenance for an HK21 machine-gun photo licensed under CC BY-SA 2.5. | Accessed: 2026-06-21