Support Equipment

50-round drum magazine

Also known as
  • G8 drum magazine
  • HK G8 50-round drum
  • X-91
  • HK91 50-round drum magazine
  • PTR-91 50-round drum magazine
  • PSG1 50-round drum magazine
  • MSG90 50-round drum magazine
  • HK11 50-round drum magazine
  • HK11A1 50-round drum magazine
  • HK21 50-round drum magazine
  • CETME 50-round drum magazine

The 50-round drum magazine is a U.S.-made .308 / 7.62x51 NATO drum accessory sold for HK91, G3, PTR-91, PSG1, MSG90, HK11, and related roller-delayed firearms. X Products describes the X-91 as a compact aluminum drum derived from the German G8 concept, while HK21 sources place 50-round drum feed within the HK21/HK11 modular machine-gun family.

50-round drum magazine, 50-round drum magazine, Support Equipment
Image source: X-91 Skeletonized High Capacity Drum Magazine
Profile / Specs

Profile

Origin
United States
Built by
X Products
Type
50-round drum magazine
Service note
Contemporary accessory based on a German G8 drum concept
Designed
2005
Unit cost
$329.00
Produced
2009-present

Specifications

Capacity
50 rounds
Cartridge
7.62x51 mm NATO / .308 Winchester
Compatibility
HK21 magazine-feed configurations; HK91, G3, PTR-91, HK11, HK11A1, PSG1, MSG90, and CETME-type clones
Construction
Aluminum body with steel and aluminum internal components
Feed Design
Single-stack coil drum with loading wheel and tension-relief feature
Weight
About 4 lb loaded
Finish
Cerakote finish
Compatible G3-Family Rifles

Commercial listings place the drum in the HK91 / G3 pattern, with fitment notes for PTR-91, CETME-type, and in-spec clone receivers.

Compatible itemItem typeCompatibility evidence
Heckler & Koch G3, 7.62 mm select-fire battle rifle, Infantry WeaponsHeckler & Koch G37.62 mm battle rifle family

HK Parts lists G3 compatibility for the 50-round drum and X Products lists G3-pattern clone fitment for the X-91.

Sources: HK91, G3, PSG1, HK11 Drum Magazine - 50 Round, X-91 Skeletonized High Capacity Drum Magazine

Fitment limits

HK Parts notes that some CETME and clone receivers may need fitting, and it recommends a break-in process for the drum.

Sources: HK91, G3, PSG1, HK11 Drum Magazine - 50 Round

Machine-Gun Feed Context

HK21 and HK11-family sources describe the drum as part of the magazine-feed side of Heckler & Koch's modular 7.62 mm roller-delayed weapons.

Compatible itemItem typeCompatibility evidence
HK21 general-purpose machine gun, 7.62 mm general-purpose machine gun, Infantry WeaponsHK21 general-purpose machine gunGeneral-purpose machine gun

Small Arms Review describes operator-level conversion from belt feed to box-magazine or drum feed and identifies the G8 as a 7.62 mm box-magazine-fed HK21E variant using a special 50-round drum.

Sources: The HK21E Machine Gun, HK421: Eine neue Dimension des Universalgewehrs G8

Feed And Fitment Notes

The drum sits between two related contexts: a current U.S. commercial X-91/HK Parts accessory for G3-pattern rifles, and the older G8/HK11/HK21 magazine-feed concept that gave the 50-round drum its military-family association.

Current commercial fit

X Products lists HK-91, PTR-91, C-91, SW-91, MKE-91, and G3-pattern clone compatibility for the X-91.

HK Parts fitment caution

HK Parts lists HK91, G3, PTR, PSG1, MSG90, HK11/11A1, CETME, and in-spec clone compatibility, but warns that some clone receivers may need fitting.

G8 / HK21 context

Small Arms Review describes the G8 as a 7.62 mm box-magazine-fed HK21E variant associated with a special 50-round drum, and a Heckler & Koch article illustrates G8 accessories including a 50-round drum magazine.

Sources: X-91 Skeletonized High Capacity Drum Magazine; HK91, G3, PSG1, HK11 Drum Magazine - 50 Round; The HK21E Machine Gun; HK421: Eine neue Dimension des Universalgewehrs G8.

Media

50-round drum magazine Videos

50-round drum magazine Images

50-round drum magazine, 50-round drum magazine, Support Equipment - view 1
Source: X-91 Skeletonized High Capacity Drum Magazine
50-round drum magazine, 50-round drum magazine, Support Equipment - view 2
Source: X-91 Skeletonized High Capacity Drum Magazine
Related Weapon Systems
M1147 120 mm advanced multipurpose round, 120 mm high-explosive multipurpose tank cartridge, MunitionsMunitionsM1147 120 mm advanced multipurpose round120 mm high-explosive multipurpose tank cartridgeThe M1147 AMP, formally a 120 mm High Explosive Multi-Purpose with Tracer cartridge, is a U.S. multipurpose tank round for Abrams crews. Army, DOT&E, and budget material describe it as an Abrams-employed line-of-sight munition that consolidates several legacy 120 mm cartridge roles into a programmable round with point-detonate, delayed, and airburst settings, while a 2026 contract notice shows production planned for U.S. Army and possible Foreign Military Sales customers.
DM6 linked ammunition belt, German disintegrating metallic link ammunition belt, Support EquipmentSupport EquipmentDM6 linked ammunition beltGerman disintegrating metallic link ammunition beltThe DM6 linked ammunition belt is a German 7.62x51 mm NATO disintegrating metallic link belt treated in HK21/HK21E references as the German counterpart to the U.S. M13 link. Small Arms Review documents HK21E operation with American M13 or German DM6 disintegrating links, while a 1998 Heckler & Koch parts list and current HK21E starter-tab listings place the belt in the HK21E feed-system accessory set rather than as an independently documented conflict item.

Sources

X-91 Skeletonized High Capacity Drum MagazinePublisher: X Products | Note: Supports the X-91 drum's 50-round capacity, .308 / 7.62x51 NATO chambering, aluminum construction, HK91/PTR-91 fitment, G8 inspiration, 2005 development, 2009 production context, and embedded manufacturer video selection. | Accessed: 2026-07-01HK91, G3, PSG1, HK11 Drum Magazine - 50 RoundPublisher: HK Parts | Note: Supports U.S.-made billet-aluminum construction, HK91/G3/PTR/PSG1/MSG90/HK11/11A1/CETME compatibility, break-in guidance, and product-image provenance for the current gallery. | Accessed: 2026-07-01The HK21E Machine GunPublisher: Small Arms Review | Note: Supports HK21 magazine-feed conversion with a 50-round drum magazine and G8 box-magazine-fed HK21E context. | Accessed: 2026-07-01HK421: Eine neue Dimension des Universalgewehrs G8Publisher: Heckler & Koch / Polizeipraxis | Note: Supports official G8/HK21 background and identifies a 50-round drum magazine among G8 accessory context. | Accessed: 2026-07-01