M27 Infantry Automatic Rifle
E336279
The M27 Infantry Automatic Rifle is a lightweight, magazine-fed 5.56×45mm weapon used by the U.S. Marine Corps as a squad-level automatic rifle and designated marksman platform.
All labels observed (4)
| Label | Occurrences |
|---|---|
| M27 Infantry Automatic Rifle canonical | 7 |
| M249 SAW in some USMC roles | 1 |
| M27 IAR | 1 |
| M38 Designated Marksman Rifle | 1 |
How this entity was disambiguated
This entity first appeared as the object of triple T3199176 — resolving that mention is where its identity was fixed. The disambiguator weighed these candidate entities and picked the highlighted one (or “None”, minting a new entity). This is how homonymy is resolved: the same surface form can point to different entities.
NED1
Entity disambiguation (via context triple)
gpt-5-mini-2025-08-07
Target entity: M27 Infantry Automatic Rifle Context triple: [2nd Battalion, 4th Marines, primaryWeapon, M27 Infantry Automatic Rifle]
-
A.
M14 rifle
The M14 rifle is a 7.62×51mm NATO battle rifle that served as the standard-issue U.S. military service rifle in the late 1950s and 1960s and remains in limited use for ceremonial and designated marksman roles.
-
B.
HK21 machine gun
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.
-
C.
MG4 light machine gun
The MG4 light machine gun is a modern 5.56×45mm NATO belt-fed squad automatic weapon developed by German arms manufacturer Heckler & Koch for reliable, sustained infantry fire.
-
D.
AK5 assault rifle
The AK5 assault rifle is a Swedish-made, 5.56×45mm NATO service rifle that serves as the standard infantry weapon of the Swedish Armed Forces.
-
E.
M16 rifle
The M16 rifle is a lightweight, 5.56×45mm NATO, gas-operated assault rifle that has been a standard-issue infantry weapon for the U.S. military and many allied forces since the Vietnam War era.
- F. None of above. chosen
- G. Unsure - the case is ambiguous/there is not enough information to decide.
NED2
Entity disambiguation (via description)
gpt-5-mini-2025-08-07
Target entity: M27 Infantry Automatic Rifle Target entity description: The M27 Infantry Automatic Rifle is a lightweight, magazine-fed 5.56×45mm weapon used by the U.S. Marine Corps as a squad-level automatic rifle and designated marksman platform.
-
A.
M14 rifle
The M14 rifle is a 7.62×51mm NATO battle rifle that served as the standard-issue U.S. military service rifle in the late 1950s and 1960s and remains in limited use for ceremonial and designated marksman roles.
-
B.
HK21 machine gun
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.
-
C.
MG4 light machine gun
The MG4 light machine gun is a modern 5.56×45mm NATO belt-fed squad automatic weapon developed by German arms manufacturer Heckler & Koch for reliable, sustained infantry fire.
-
D.
AK5 assault rifle
The AK5 assault rifle is a Swedish-made, 5.56×45mm NATO service rifle that serves as the standard infantry weapon of the Swedish Armed Forces.
-
E.
M16 rifle
The M16 rifle is a lightweight, 5.56×45mm NATO, gas-operated assault rifle that has been a standard-issue infantry weapon for the U.S. military and many allied forces since the Vietnam War era.
- F. None of above. chosen
Statements (48)
| Predicate | Object |
|---|---|
| instanceOf |
automatic rifle
ⓘ
designated marksman rifle ⓘ light machine gun ⓘ |
| action | gas-operated ⓘ |
| adoptedBy | United States Marine Corps in 2010 ⓘ |
| barrelLength | 16.5 inches ⓘ |
| basedOn |
Heckler & Koch HK416
ⓘ
linked to:
HK416F assault rifle
|
| caliber | 5.56×45mm NATO ⓘ |
| cartridge | 5.56×45mm NATO ⓘ |
| chambering | 5.56 NATO ⓘ |
| countryOfOrigin |
United States
ⓘ
linked to:
United States of America
|
| designedFor |
improved reliability with piston system
ⓘ
increased accuracy over belt-fed SAWs ⓘ |
| feedSystem |
30-round detachable box magazine
ⓘ
STANAG magazine ⓘ |
| fireModes |
fully automatic
ⓘ
semi-automatic ⓘ |
| gasSystem | short-stroke gas piston ⓘ |
| handguard | free-floating rail handguard ⓘ |
| hasVariant |
M38 Designated Marksman Rifle
ⓘ
linked to:
M27 Infantry Automatic Rifle
|
| introduced | late 2000s ⓘ |
| manufacturer | Heckler & Koch ⓘ |
| material | steel and aluminum alloy construction ⓘ |
| officialDesignation |
M27 IAR
ⓘ
linked to:
M27 Infantry Automatic Rifle
|
| operation | rotating bolt ⓘ |
| overallLength | approximately 33 inches with stock extended ⓘ |
| primaryUser | United States Marine Corps infantry squads ⓘ |
| railSystem |
Picatinny rail
ⓘ
linked to:
Picatinny rail (on upgraded models)
|
| rateOfFire | approximately 700–900 rounds per minute ⓘ |
| replaces |
M249 SAW in some USMC roles
ⓘ
linked to:
M27 Infantry Automatic Rifle
|
| role |
designated marksman platform
ⓘ
infantry automatic rifle ⓘ squad automatic weapon ⓘ |
| serviceEntry | 2010 ⓘ |
| sights |
backup iron sights
ⓘ
optical sights ⓘ |
| standardIssue |
automatic riflemen in USMC fire teams
ⓘ
designated marksmen in some USMC units ⓘ |
| stockType | adjustable buttstock ⓘ |
| type | magazine-fed automatic rifle ⓘ |
| usedAs | precision rifle in some Marine units ⓘ |
| usedBy |
United States Army
ⓘ
United States Marine Corps ⓘ United States Navy ⓘ United States Special Operations Command ⓘ
linked to:
U.S. Special Operations Command
|
| usedInConflict |
Iraq War (post-2010 operations)
ⓘ
linked to:
Operation Inherent Resolve
War in Afghanistan ⓘ |
| weight | approximately 3.6 kg unloaded ⓘ |
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: M27 Infantry Automatic Rifle Description of subject: The M27 Infantry Automatic Rifle is a lightweight, magazine-fed 5.56×45mm weapon used by the U.S. Marine Corps as a squad-level automatic rifle and designated marksman platform.
Referenced by (10)
Full triples — surface form annotated when it differs from this entity's canonical label.
subject linked to:
2nd Battalion, 4th Marines (attached at times)
subject linked to:
Golf Company
linked to: M27 Infantry Automatic Rifle
linked to: M27 Infantry Automatic Rifle
linked to: M27 Infantry Automatic Rifle
subject linked to:
Echo Company