Support Equipment

50-round drum magazine

Also known as

G8 drum magazine
X-91
HK91 50-round drum magazine
HK21 50-round drum magazine

The 50-round drum magazine is a U.S.-made .308 / 7.62x51 NATO drum accessory sold by X Products and HK Parts for HK91, G3, PTR-91, PSG1, MSG90, HK11, and similar clones. X Products describes its X-91 as a compact aluminum drum based on the German G8 concept, while HK21 sources state the machine gun can be converted to magazine feed with a 50-round drum magazine.

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

ammunition support equipment small arms

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
Weight: About 4 lb loaded
Finish: Cerakote finish

Compatible Machine Guns

HK21 sources describe magazine-feed conversion with a 50-round drum magazine, and current .308 listings place the drum in the HK91 / G3 family.

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

HK21 sources state the machine gun can be converted to magazine feed with a 50-round drum magazine.

Sources: The HK21E Machine Gun

Service And Conflict Use

Service History

In service: Used with HK21 magazine-feed configurations and HK91 / G3-pattern rifles

Media

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

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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 compatibility, listed price, and product-image provenance. | Accessed: 2026-06-27 HK91, 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, and the break-in guidance for the drum. | Accessed: 2026-06-27 The HK21E Machine GunPublisher: Small Arms Review | Note: Supports HK21 magazine-feed conversion with a 50-round drum magazine. | Accessed: 2026-06-27