Artillery

120mm MO-120-AM50

Also known as
  • MO-120-AM50
  • MO-120 AM50
  • MO 120 AM50
  • MO-120-AM-50
  • MO-120 AM-50
  • Brandt AM-50
  • Brandt 120 mm AM50
  • MW-50
  • MW-50 120mm
  • MW-50 120 mm
  • Mortier Brandt de 120mm type A. M. 50

The 120mm MO-120-AM50 is a French Brandt smoothbore heavy mortar developed after World War II and fielded from the 1950s as a towed, baseplate-fired, or carriage-fired infantry support weapon. It predates the later MO-120 RT rifled mortar family and appears in the catalog through two direct evidence lanes: an Imperial War Museums object record for an Argentine Army Brandt 120 mm mortar captured during the Falklands War, and SIPRI transfer data recording Denmark's 2024 delivery of MW-50 120mm mortars to Ukraine.

120mm MO-120-AM50, 120 mm smoothbore heavy mortar, Artillery
Image source: WeaponSystems.net AM50 Indochina Image

Role in Conflicts

Profile / Specs

Profile

Origin
France
Built by
Brandt
Type
120 mm smoothbore heavy mortar
Service note
Early Cold War design with later limited service
Designer
Brandt
Designed
Late 1940s
Produced
1950s-1970s
Number built
At least several hundred

Specifications

Caliber
120 mm smoothbore mortar
Crew
4
Weight
242 kg in firing position; 402 kg on carriage
IWM object dimensions
102 in long in towed mode; 78 in long in deployed mode; 120 mm calibre
Component weights
76 kg barrel including towing eye; 86 kg bipod; 80 kg baseplate; 137 kg carriage
Range
0.5-6.6 km
Rate of fire
12 rounds per minute maximum; 8 rounds per minute normal
Elevation
+45 to +85 degrees
Traverse
17 degrees total at 60 degrees elevation; 360 degrees on baseplate
Ammunition examples
M44 high-explosive, Mk 62 illumination, Mk 62 smoke, and PEPA rocket-assisted mortar bombs
Mobility
Separate two-wheel carriage, normally towed by a 4x4 light truck
Design And Carriage

The AM50 is a conventional muzzle-loaded smoothbore heavy mortar built around a 120 mm tube, adjustable bipod, large baseplate, and separate two-wheel carriage. The carriage allowed towing by a light truck and also allowed firing from the wheeled mount when the axle was locked, while normal emplacement used the bipod and baseplate.

Tube architecture

Smoothbore 120 mm mortar rather than the rifled tube used on the later MO-120 RT family.

Movement

Separate two-wheel carriage for light-truck towing; Military Periscope describes the barrel horizontal in travel position with the baseplate folded behind the wheels.

Firing envelope

Reference data lists a 0.5 km minimum range, 6.6 km maximum range, +45 to +85 degree elevation, and 17 degrees of traverse at 60 degrees elevation.

Variants

AM50 is treated as the earlier smoothbore Brandt 120 mm mortar branch; the later MO-120 RT page covers the heavier rifled successor family.

VariantConfigurationDesignation notes
MO-120 RT, 120 mm rifled towed heavy mortar, ArtilleryMO-120 RTLater rifled 120 mm mortar successor family

WeaponSystems.net identifies the MO-120 RT as the heavier, longer-range rifled mortar that replaced the AM50 in France and several other armies.

Sources: WeaponSystems.net MO-120-AM50

Ammunition Fired

Reference sources describe the AM50 as a 120 mm smoothbore mortar that fires conventional heavy-mortar bomb families rather than the later rifled MO-120 RT ammunition package.

AmmunitionAmmunition typeFiring evidence
Mortar bombs, 120mm, Heavy mortar ammunition, MunitionsMortar bombs, 120mm120 mm mortar ammunition

Military Periscope lists M44 high-explosive, Mk 62 illuminating, Mk 62 smoke, and PEPA rocket-assisted ammunition for the AM50 120 mm mortar.

Sources: Military Periscope AM 50 Mortar

Compatibility limit

The relationship is caliber-and-source specific: it documents AM50 use of named 120 mm mortar-bomb families, not universal compatibility with every modern 120 mm round.

Sources: Military Periscope AM 50 Mortar

Timeline

120mm MO-120-AM50 Key Events

  1. Postwar development

    WeaponSystems.net places AM50 development in the late 1940s as an early Cold War French heavy-mortar design.

    Sources: WeaponSystems.net MO-120-AM50

  2. Service entry

    Reference data places the MO-120-AM50 in service during the 1950s, with production continuing into the 1970s.

    Sources: WeaponSystems.net MO-120-AM50

  3. Falklands War captured example

    Imperial War Museums catalogues a Brandt 120 mm mortar associated with the Argentine Army and captured during the Falklands War.

    Sources: Imperial War Museums MO-120-AM50 Mortar

  4. Danish MW-50 transfer to Ukraine

    SIPRI records Denmark delivering ten MW-50 120mm mortars to Ukraine during the full-scale phase of the Russia-Ukraine war.

    Sources: SIPRI Arms Transfers Database MW-50

Media

120mm MO-120-AM50 Images

120mm MO-120-AM50, 120 mm smoothbore heavy mortar, Artillery - view 1
Source: WeaponSystems.net AM50 Manual Image
Related Weapon Systems
MO-120 RT, 120 mm rifled towed heavy mortar, ArtilleryArtilleryMO-120 RT120 mm rifled towed heavy mortarThe MO-120 RT is a French 120 mm rifled towed heavy mortar developed by Brandt and later associated with TDA/Thales production. Its rifled barrel, two-wheel carriage, and rocket-assisted ammunition option give it longer range than many smoothbore infantry mortars, while keeping the system towable by light or medium vehicles. The family also appears through derivatives such as the U.S. Marine Corps M327 EFSS and Turkey's HY-12, giving the page conflict evidence from Ukraine, Mali, Afghanistan, Yemen, and Colombia.
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Sources

WeaponSystems.net MO-120-AM50Publisher: WeaponSystems.net | Note: Supports AM50 designation, French origin, Brandt/producer context, development and production dates, design description, specifications, limited-service status, export background, and the MO-120 RT successor relationship. | Accessed: 2026-07-13Imperial War Museums MO-120-AM50 MortarPublisher: Imperial War Museums | Note: Directly supports 1982 Falklands War conflict-use context by cataloguing a French-manufactured Brandt 120 mm mortar associated with the Argentine Army and captured during the conflict; also supports physical description and creator. | Accessed: 2026-07-13SIPRI Arms Transfers Database MW-50Publisher: Stockholm International Peace Research Institute | Note: Directly supports 2014 Russia-Ukraine War conflict usage by recording SIPRI transfer-register entry tradeId 68851: Denmark supplied ten MW-50 120mm mortars to Ukraine in 2024. | Accessed: 2026-07-13Military Periscope AM 50 MortarPublisher: Military Periscope | Note: Supports AM50 country of origin, two-wheel carriage description, firing with or without the carriage, travel-position layout, and listed ammunition families including M44 HE, Mk 62 illumination, Mk 62 smoke, and PEPA rocket-assisted rounds. | Accessed: 2026-07-13WeaponSystems.net AM50 Indochina ImagePublisher: WeaponSystems.net | Note: Supports the reusable primary image; the WeaponSystems.net AM50 media caption identifies this image as public domain and shows French paratroopers with AM50 mortars in Indochina. | Accessed: 2026-07-13WeaponSystems.net AM50 Manual ImagePublisher: WeaponSystems.net | Note: Supports the additional gallery image showing the Mortier Brandt de 120 mm Type A.M. 50 designation in an AM50 manual image. | Accessed: 2026-07-13