M855A1
E1027038
M855A1 is a U.S. military enhanced-performance 5.56×45mm rifle cartridge designed to improve accuracy, penetration, and consistency over earlier standard-issue rounds.
All labels observed (2)
| Label | Occurrences |
|---|---|
| 5.56mm Ball, M855A1 | 1 |
| M855A1 canonical | 1 |
How this entity was disambiguated
This entity first appeared as the object of triple T13202982 — 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: M855A1 Context triple: [5.56×45mm NATO, hasMilitaryDesignation, M855A1]
-
A.
5.56×45mm NATO
The 5.56×45mm NATO is a standard intermediate rifle cartridge widely used by NATO forces and many militaries worldwide in assault rifles and light machine guns.
-
B.
M4 carbine
The M4 carbine is a lightweight, gas-operated, magazine-fed 5.56×45mm NATO assault rifle widely used by modern military forces, particularly the U.S. armed forces.
-
C.
.300 AAC Blackout
.300 AAC Blackout is an intermediate rifle cartridge developed for the AR-15 platform, designed to offer improved performance in short barrels and with both supersonic and subsonic loads, particularly when used with suppressors.
-
D.
.223 Remington
.223 Remington is a popular small-caliber, high-velocity rifle cartridge widely used for sporting, hunting, and varmint shooting, and closely associated with modern semi-automatic rifles.
-
E.
HK417 battle rifle
The HK417 battle rifle is a German-designed, gas-operated, selective-fire rifle chambered in 7.62×51mm NATO, known for its reliability, accuracy, and use by military and special forces units worldwide.
- 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: M855A1 Target entity description: M855A1 is a U.S. military enhanced-performance 5.56×45mm rifle cartridge designed to improve accuracy, penetration, and consistency over earlier standard-issue rounds.
-
A.
5.56×45mm NATO
The 5.56×45mm NATO is a standard intermediate rifle cartridge widely used by NATO forces and many militaries worldwide in assault rifles and light machine guns.
-
B.
M4 carbine
The M4 carbine is a lightweight, gas-operated, magazine-fed 5.56×45mm NATO assault rifle widely used by modern military forces, particularly the U.S. armed forces.
-
C.
.300 AAC Blackout
.300 AAC Blackout is an intermediate rifle cartridge developed for the AR-15 platform, designed to offer improved performance in short barrels and with both supersonic and subsonic loads, particularly when used with suppressors.
-
D.
.223 Remington
.223 Remington is a popular small-caliber, high-velocity rifle cartridge widely used for sporting, hunting, and varmint shooting, and closely associated with modern semi-automatic rifles.
-
E.
HK417 battle rifle
The HK417 battle rifle is a German-designed, gas-operated, selective-fire rifle chambered in 7.62×51mm NATO, known for its reliability, accuracy, and use by military and special forces units worldwide.
- F. None of above. chosen
Statements (47)
| Predicate | Object |
|---|---|
| instanceOf |
5.56×45mm NATO cartridge
ⓘ
rifle cartridge ⓘ |
| abbreviation | EPR ⓘ |
| adopted | around 2010 ⓘ |
| alsoKnownAs | Enhanced Performance Round ⓘ |
| ammunitionType | ball round ⓘ |
| ballisticPerformanceComparedTo |
higher muzzle velocity than M855
ⓘ
more consistent trajectory than M855 ⓘ |
| caliber | 5.56×45mm NATO ⓘ |
| category | small arms ammunition ⓘ |
| compatibleWith | STANAG 4179 magazine-fed 5.56×45mm weapons ⓘ |
| countryOfOrigin |
United States
ⓘ
linked to:
United States of America
|
| designedFor | combat use ⓘ |
| designedToMeetRequirementOf | U.S. Army Picatinny Arsenal small arms program ⓘ |
| designedToReplace | M855 green tip cartridge ⓘ |
| designer |
U.S. Army
ⓘ
linked to:
United States Army
|
| environmentalRegulationResponse | reduction of lead contamination on training ranges ⓘ |
| feature |
copper slug core
ⓘ
enhanced hard-target performance ⓘ environmentally friendly design compared to lead-core rounds ⓘ exposed steel penetrator tip ⓘ improved soft-target terminal performance compared to M855 ⓘ lead-free projectile core ⓘ |
| governingStandard | U.S. military ammunition specifications ⓘ |
| hasComponent |
brass cartridge case
ⓘ
non-lead projectile ⓘ primer ⓘ propellant charge ⓘ |
| improvesOn |
barrier penetration of M855
ⓘ
lot-to-lot consistency of M855 ⓘ terminal performance of M855 ⓘ |
| intendedPlatform |
M16 rifle
ⓘ
M4 carbine ⓘ other 5.56×45mm NATO firearms ⓘ |
| isSuccessorOf | M855 ⓘ |
| militaryDesignation |
5.56mm Ball, M855A1
ⓘ
linked to:
M855A1
|
| optimizedFor | shorter-barreled carbines such as the M4 ⓘ |
| penetrationPerformanceComparedTo | better performance against steel and intermediate barriers than M855 ⓘ |
| propellantType | smokeless powder ⓘ |
| purpose |
improved accuracy
ⓘ
improved consistency ⓘ improved penetration ⓘ |
| standardIssueFor |
U.S. Army combat forces
ⓘ
linked to:
United States Army
|
| usedBy |
United States Army
ⓘ
United States Marine Corps ⓘ |
| usedInConflict |
Iraq War (post-adoption period)
ⓘ
linked to:
Iraq conflict post-2011 U.S. withdrawal
War in Afghanistan ⓘ
linked to:
War in Afghanistan (2001–2021)
|
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: M855A1 Description of subject: M855A1 is a U.S. military enhanced-performance 5.56×45mm rifle cartridge designed to improve accuracy, penetration, and consistency over earlier standard-issue rounds.
Referenced by (2)
Full triples — surface form annotated when it differs from this entity's canonical label.
linked to: M855A1