M931 Full Range Practice Cartridge

The M931 Full Range Practice Cartridge is a U.S. 120 mm practice mortar round for the M120A1 and M121 battalion mortar systems. Army portfolio material says it is ballistically similar in size, shape, and weight to the M934A1 and M933A1 high-explosive cartridges and uses an M781 practice fuze that gives flash, bang, and smoke on impact.

M931 Full Range Practice Cartridge, 120 mm full-range practice mortar cartridge, Munitions

Image source: DVIDS: NY National Guard Fires Mortars in Morocco [Image 1 of 5]

Profile

Origin: United States
Built by: PM Combat Ammunition SystemsGeneral Dynamics Canada
Built in: United StatesCanada
Type: 120 mm full-range practice mortar cartridge
Service note: Introduced in 1999
Designed: 1999
Produced: January 1999

mortarpracticetraining artillery

Specifications

Caliber: 120 mm
Role: Full-range practice cartridge
Compatible systems: M120A1 and M121 battalion mortar systems
Range: 200 to 7,200 meters
Rate of fire: Maximum 15 rounds per minute; sustained 6 rounds per minute
Weight: 30 pounds
Length: 27.99 inches
Fuze: M781 point-detonating practice fuze
Signature: Flash, bang, and smoke on impact
Similarity: Ballistically similar to the M934A1 and M933A1 HE cartridges

Service And Conflict Use

Service History

In service: Full-range practice round for the M120A1 and M121 battalion mortar systems.

Firing Weapons

Army portfolio material identifies the M931 as a full-range practice round for the M120A1 and M121 battalion mortar systems.

Firing weapon

Weapon type

Firing evidence

120 mm mortar family

The Army portfolio book says the M931 is a full-range practice round for use in the M120A1 and M121 Battalion Mortar Systems, with ballistics similar to the M934A1 and M933A1 high-explosive cartridges.

Sources: PEO Ammunition 2017 Portfolio Book

M931 Full Range Practice Cartridge Images

M931 Full Range Practice Cartridge, 120 mm full-range practice mortar cartridge, Munitions - view 1 — Source: DVIDS: NY National Guard Fires Mortars in Morocco [Image 1 of 5]

M931 Full Range Practice Cartridge, 120 mm full-range practice mortar cartridge, Munitions - view 2 — Source: DVIDS: NY National Guard Fires Mortars in Morocco [Image 1 of 5]

M931 Full Range Practice Cartridge, 120 mm full-range practice mortar cartridge, Munitions - view 3 — Source: DVIDS: NY National Guard Fires Mortars in Morocco [Image 1 of 5]

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Sources

PEO Ammunition 2017 Portfolio BookPublisher: U.S. Army Capability Program Executive Ammunition & Energetics | Note: Supports the M931 full-range practice cartridge description, M120A1 and M121 compatibility, ballistics, M781 practice fuze, production context, and PM CAS / General Dynamics Canada load, assemble, and pack context. | Accessed: 2026-06-23 DVIDS: NY National Guard Fires Mortars in Morocco [Image 1 of 5]Publisher: DVIDS | Note: Public-domain image page for a U.S. Army photo showing a soldier holding the M931 120 mm far range training round at a mortar range during African Lion 2024. | Accessed: 2026-06-23 DVIDS: NY National Guard Fires Mortars in Morocco [Image 2 of 5]Publisher: DVIDS | Note: Public-domain image page for a related U.S. Army photo from the same M931 mortar-training series. | Accessed: 2026-06-23 DVIDS: NY National Guard Fires Mortars in Morocco [Image 4 of 5]Publisher: DVIDS | Note: Public-domain image page for a related U.S. Army photo from the same M931 mortar-training series. | Accessed: 2026-06-23