Tag Archives: mortar

E10707M – M327 120 MM MORTAR EXPEDITIONARY FIRE SUPPORT SYSTEM (EFSS)

The Expeditionary Fire Support System (EFSS) will be the final system of the land-based fire support triad that includes the LW 155 and HIMARS. It is designated to accompany the MAGTF in any expeditionary mode of operations. It will be the primary indirect fire support system for the vertical assault element of the ship-to-objective maneuver (STOM) force. The EFSS shall be capable of 110 nautical mile lift internal to the CH-53E aircraft. The Expeditionary Fire Support System (EFSS) is a fire support system that is designated to accompany the MAGTF in any expeditionary mode of operations.

E1095 – M252 81mm Mortar System

The M252 81mm Mortar System was developed under a co-developement agreement with the United Kingdom to replace the M29A1 Mortar. A Blast Attenuation Device (BAD) is attached to the muzzle of the cannon assembly to reduce the blast effects on the mortar crew. The M252 is ideally suited to support airborne, air assault, mountain and light infantry units.
Length: 56 inches (142.24 centimeters)
Bore diameter: 81mm
Elevation: 45 to 85 degrees
Weight:

  • Mortar Assembly: 35 pounds (15.89 kg)
  • Bipod: 26 pounds (11.80 kilograms)
  • Baseplate: 25.5 pounds (11.58 kilograms)
  • Sight Unit: 2.5 pounds (1.14 kilograms)
  • Total: 89 pounds (40.41 kilograms)

Maximum effective range: 5700 meters
Minimum Range: 80 meters

Rates of fire:

  • Maximum: 33 rounds per minute
  • Sustained: 16 rounds per minute

Unit Replacement Cost: $24,717

Type Classified Standard: July 1984
The M252 Mortar System consists of the following major components:

  • M253 Cannon Assembly (35 lbs)
  • M177 Bipod Assembly (27 lbs)
  • M3A1 Baseplate (25.5 lbs)

Features: The M252 81mm Medium Extended Range Mortar is a crew-served, medium weight mortar which is highly accurate and provides for a greater range (4,500 meters to 5,650 meters) and lethality than the previous 81mm mortar. The cannon has a crew-removable breech plug and firing pin. The muzzle end has a short tapered lead-in which acts as a blast attenuator device. The breech end is finned for better cooling. This mortar also uses the standard M64 mortar sight of the 60mm mortar, M224.

Background: This mortar replaced the previous Marine Corps 81mm mortar in 1986. The M252 is an adaptation of the standard British 81mm mortar developed in the 1970s. It is mostly commonly found in the mortar platoon of an infantry battalion.

E1065 – M224 Mortar System

The M224 60mm LWCMS is ideally suited to support airborne, air assault, mountain, ranger, Special Operations Forces and light infantry units. The M224 can be drop fired (conventional mode) or trigger fired (conventional or hand-held mode). A lightweight auxiliary baseplate is used when firing the mortar in the hand-held mode.
Length: 40 inches (101.6 centimeters)
Weight: 46.5 pounds (21.11 kilograms)
Bore diameter: 60mm
Maximum effective range: 2.17 miles (3490 meters)
Rates of fire:

  • Maximum: 30 rounds/minute
  • Sustained: 20 rounds/minute

Unit Replacement Cost: $10,658

The M224 Mortar System consists of the following major components:

  • M225 Cannon Assembly (14.4 lbs)
  • M170 Bipod Assembly (15.2 lbs)
  • M7 Baseplate (14.4 lbs)
  • M8 Auxiliary Baseplate (3.6 lbs)

Mission: To provide the company commander with an indirect-fire weapon.

Features: The M224 60mm Lightweight Mortar is a smooth bore, muzzle loading, high-angle-of-fire weapon. The cannon assembly is composed of the barrel, combination base cap, and firing mechanism. The mount consists of a bipod and a base plate which is provided with screw type elevating and traversing mechanisms to elevate/traverse the mortar. The M64 sight unit is attached to the bipod mount via a standard dovetail. An additional short range sight is attached to the base of the cannon tube for firing the mortar on the move and during assaults. It has a spring-type shock absorber to absorb the shock of recoil in firing.

Background: The M224 replaced the older (WWII era) M2 and M19, 60mm Mortars. These weapons only possessed 2,200 yards of effective range. The M224 was designed to fire all types of the older ammunition, but its primary rounds are of the newer, longer-range type.