HK21 machine gun
E197571
The HK21 machine gun is a German-designed, belt-fed general-purpose machine gun developed by Heckler & Koch and based on the G3 rifle’s roller-delayed blowback system.
All labels observed (3)
| Label | Occurrences |
|---|---|
| HK21 machine gun canonical | 1 |
| Heckler & Koch 20-series machine guns | 1 |
| L7A2 GPMG | 1 |
Statements (49)
| Predicate | Object |
|---|---|
| instanceOf |
belt-fed machine gun
ⓘ
firearm ⓘ general-purpose machine gun ⓘ |
| action | roller-delayed blowback ⓘ |
| barrelFeature | quick-change barrel ⓘ |
| basedOn | Heckler & Koch G3 rifle ⓘ |
| caliber | 7.62 mm ⓘ |
| canBeConvertedTo | magazine feed using G3 magazines ⓘ |
| cartridge |
.308 Winchester (commercial equivalent)
ⓘ
7.62×51mm NATO ⓘ |
| category | crew-served weapon ⓘ |
| chamberType | fluted chamber ⓘ |
| countryOfOrigin | Germany ⓘ |
| designer | Heckler & Koch ⓘ |
| feedSystem |
belt-fed
ⓘ
magazine-fed (with conversion) ⓘ |
| fireModes |
fully automatic
ⓘ
selective fire ⓘ |
| gasSystem | no gas system (recoil-operated, roller-delayed) ⓘ |
| hasVariant |
HK11
ⓘ
HK13 ⓘ HK21 ⓘ
surface form:
HK21A1
HK21 ⓘ
surface form:
HK21E
HK23 ⓘ HK23E ⓘ |
| intendedUse | infantry support weapon ⓘ |
| introducedInDecade | 1960s ⓘ |
| isPartOf |
HK21 machine gun
self-linksurface differs
ⓘ
surface form:
Heckler & Koch 20-series machine guns
|
| manufacturer | Heckler & Koch ⓘ |
| mountingOptions |
bipod
ⓘ
tripod ⓘ vehicle mount ⓘ |
| operatingPrinciple | roller-delayed blowback with fluted chamber ⓘ |
| primaryRole | general-purpose machine gun ⓘ |
| rateOfFire | approximately 800 rounds per minute ⓘ |
| relatedWeapon |
Heckler & Koch G3 rifle
ⓘ
surface form:
Heckler & Koch G3
Heckler & Koch MG5 ⓘ |
| safety | selector lever with safe and fire positions ⓘ |
| sightType |
iron sights
ⓘ
optical sight (with mounts) ⓘ |
| stockType |
fixed stock (standard)
ⓘ
optional retractable stock ⓘ |
| usedBy |
Brazilian Armed Forces
ⓘ
surface form:
Brazilian armed forces
German armed forces (limited and special units) ⓘ Armed Forces of Greece ⓘ
surface form:
Greek armed forces
Portuguese Armed Forces ⓘ
surface form:
Portuguese armed forces
various police and special forces units worldwide ⓘ |
| usedInConflict |
Cold War-era conflicts
ⓘ
Vietnam War (by some users) ⓘ |
How these facts were elicited
The pipeline generated the facts above by prompting gpt-5.1 with this entity's name + description and the instruction below.
Instruction
You are a knowledge base construction expert. Given a subject entity and a description of it, return factual statements that you know for the subject as a JSON list of dictionaries(triples), where keys must be "subject", "predicate" and "object". The number of facts may be very high, between 25 to 50 or more, for very popular subjects. For less popular subjects, the number of facts can be very low, like 5 or 10. # Requirements - If you don't know the subject at all, return an empty list. - If the subject is not a named entity, return an empty list. - Include at least one triple where predicate is "instanceOf". - Do not get too wordy. - Separate several objects into multiple triples with one object.
Input
Subject: HK21 machine gun Description of subject: The HK21 machine gun is a German-designed, belt-fed general-purpose machine gun developed by Heckler & Koch and based on the G3 rifle’s roller-delayed blowback system.
Referenced by (3)
Full triples — surface form annotated when it differs from this entity's canonical label.
this entity surface form:
L7A2 GPMG
subject surface form:
HK21
this entity surface form:
Heckler & Koch 20-series machine guns