Support Equipment

G3 20-round detachable box magazine

Also known as

G3 magazine
Heckler & Koch G3 magazine

The G3 20-round detachable box magazine is a Heckler & Koch accessory for 7.62x51 mm NATO G3-family rifles. HK21 sources describe box-magazine-fed variants and field conversion to box magazine or drum feed, which makes the magazine relevant to HK21 magazine-feed configurations as well as the G3 rifle family.

G3 20-round detachable box magazine, 20-round detachable box magazine, Support Equipment

Image source: Commons G3A3 Disassembled Mod Image

Profile / Specs

Profile

Origin: Germany
Built by: Heckler & Koch
Type: 20-round detachable box magazine
Unit cost: $9.95 used-market listing
Produced: Cold War era to present

small arms support equipment

Specifications

Capacity: 20 rounds
Cartridge: 7.62x51 mm NATO / .308 Winchester
Compatibility: Heckler & Koch G3-family rifles; HK21 box-magazine-fed configurations
Construction: Detachable box magazine
Material: Steel or aluminum

Compatible Machine Guns

HK21 sources describe box-magazine-fed variants and field conversion to box magazine or drum feed.

Compatible item

Item type

Compatibility evidence

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

HK21 general-purpose machine gun

General-purpose machine gun

Small Arms Review describes simple conversion from belt to box magazine or drum feed for the HK21E in the field.

Sources: The HK21E Machine Gun

Service And Conflict Use

Service History

In service: Used with G3-family rifles and HK21 magazine-feed configurations

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Sources

HK G3 SALW GuidePublisher: Bonn International Centre for Conflict Studies | Note: Supports the G3-family magazine context, including the standard 20-round detachable box magazine used with the rifle. | Accessed: 2026-06-27 The HK21E Machine GunPublisher: Small Arms Review | Note: Supports HK21E feed conversion, including box magazine-fed variants and conversion from belt to box magazine or drum feed. | Accessed: 2026-06-27 HK91, G3 20 Round Aluminum Magazine - UsedPublisher: HK Parts | Note: Supports current used-market pricing and the magazine's G3/HK91 compatibility listing. | Accessed: 2026-06-27 Commons G3A3 Disassembled Mod ImagePublisher: Wikimedia Commons | Note: Supports image provenance for a disassembled G3-family rifle image that includes the magazine. | Accessed: 2026-06-27