Hk21 Machine Gun

Shooting the HK21 Modular Machine Gun

Forgotten Weapons

H&K's Light Machine Guns: Rare but Effective (HK21/23 & HK11)

HK-21 machine gun

7.62x51 HK21E Belt-Fed Machine Gun: 100 Rounds Off-Hand Shooting

HK21 200 ROUNDS

Heckler & Koch's Modular Machine Gun: the HK21E

Forgotten Weapons

HK 21 .308 Beltfed Machine Gun

H&K 21 Extended breakdown

Vickers Tactical

HK21.....more testing...

American Sub Gunner

HK21 308 beltfed machine gun

HK21

HK21 Full Auto Belt Fed Machine Gun

HK Range Day: HK21

The HK21E, HKs best Beltfed

HK21 Full Auto

Hk21 full auto belt fed machine gun

HK 21K by TSC Machine with Fleming Sear

HK11A1/HK21A1 DEMILL COMPATIBLE WITH HK21E/23E FEED MECHS & CARRIERS

Heckler & Koch .308 HK21 full auto.

Ryan's Range Report

HK21 Parts Kit

Centerfire Systems