HK21 — specifications, caliber, stats, review, photos | WeaponAtlas
HK21 is a German 7.62×51mm NATO general-purpose machine gun introduced in 1961. It is based on the G3 roller-delayed blowback system, with a quick-change barrel and belt feed; magazine use was auxiliary rather than the standard configuration.
| Manufacturer | Heckler & Koch |
|---|---|
| Year introduced | 1961 |
| Caliber | 7.62×51mm NATO |
| Weight (unloaded) | 7.920 kg |
| Length | 1021 mm |
| Barrel length | 450 mm |
| Magazine capacity | 20 rounds |