Tag Archives: crew-served

E19767G AN/PAS-13D(V)2 Medium Weapon Thermal Sight (MWTS) and (V)3 Heavy Weapon Thermal Sight (HWTS)

The Thermal Weapon Sight is a selfcontained lightweight, compact, durable, battery-operated, infrared imaging sensor used for target acquisition. It can be used under conditions of limited visibility such as darkness, smoke, fog, dust and haze, and is effective during daylight hours. The MWTS and HWTS have the same design but the difference lies in the telescope and the software. The system comes with a MIL-STD-1913 rail grabber interface, including a vertical spacer. The MWTS can effectively engage targets out to 1,100 meters while the HWTS can effectively engage targets out to 2,200 meters. The U.S. Marine Corps is procuring both the Medium Weapon Thermal Sight (AN/PAS-13D (V)2) and the Heavy Weapon Thermal Sight (AN/PAS-13D (V)3).

The AN/PAS-13D (V) 2 can be mounted on the M240B Machine Gun and the M249 series. The AN/PAS-13D (V) 3 can be mounted on the M16A1/A2 Rifle, M4 series, M2 Machine Gun, and the MK19 Machine Gun.

These items are replacing the AN/PAS-13B (V) 2 Medium Weapon Thermal Sight (MWTS) and (V) 3 Heavy Weapon Thermal Sight (HWTS).

E1975 AN/PAS-13B (V) 2 Medium Weapon Thermal Sight (MWTS) and (V) 3 Heavy Weapon Thermal Sight (HWTS)

The Thermal Weapon Sight (TWS) is a lightweight, low power, high performance forward looking infrared (FLIR) device that will augment existing crew-served night vision sights. TWS is completely passive and although primarily designed for target detection and engagement with individual and crew-served weapons, it can also be utilized for all weather surveillance. The U.S. Marine Corps is procuring both the Medium Weapon Thermal Sight (AN/PAS-13B (V) 2) and the Heavy Weapon Thermal Sight (AN/PAS-13B (V)3). The MWTS can effectively engage targets out to 1000 meters while the HWTS can effectively engage targets out to 2000 meters.

The MWTS will be mounted to the M249 Squad Automatic Weapon (SAW) and M240G Medium Machine Gun. The HWTS is intended to be mounted to the M2 .50 cal Heavy Machine Gun, and MK19 40mm Machine Gun.

These items are being replaced by the AN/PAS-13D (V) 2 Medium Weapon Thermal Sight (MWTS) and (V) 3 Heavy Weapon Thermal Sight (HWTS)

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

  • 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.

E0994 – MK19 Mod3 40mm Grenade Machine Gun

The MK19 Mod3 40mm Grenade Machine Gun was first developed by the Navy in the early 1960's. TACOM-ARDEC has since suggested modifications to this system which has enabled the Army to deploy the MK19 in the harsh environments encountered during world-wide operations and has therefore enhanced its performance. The MK19 firing rate is over 350 grenades per minute and it is effective to ranges of over 2200 meters. The system was deployed in Southwest Asia during Operation Desert Storm and devastated enemy infantry.
Manufacturer: Saco Defense Industries
Length: 43.1 inches (109.47 centimeters)
Bore diameter: 40mm

  • Gun: 72.5 pounds (32.92 kilograms)
  • Cradle (MK64 Mod 5): 21.0 pounds (9.53 kilograms)
  • Tripod: 44.0 pounds (19.98 kilograms)
  • Total: 137.5 pounds (62.43 kilograms)

Muzzle velocity: 790 feet (240.69 meters) per second
Maximum range: 2200 meters
Maximum effective range: 1600 meters

Rates of fire:

  • Cyclic: 325-375 rounds per minute
  • Rapid: 60 rounds per minute
  • Sustained: 40 rounds per minute

Unit Replacement Cost: $13,758

Features: The MK19 40mm machine gun, MOD 3 is an air-cooled, disintegrating metallic link-belt fed, blowback operated, fully automatic weapon and is crew transportable over short distances with limited amounts of ammunition. It can fire a variety of 40mm grenades. The M430 HEDP 40mm grenade will pierce armor up to 2 inches thick, and will produce fragments to kill personnel within 5 meters and wound personnel within 15 meters of the point of impact. Associated components are: MK64 Cradle Mount, MOD 5; M3 Tripod Mount; and the AN/TVS-5 Night Vision Sight. The MK19 also mounts in the up-gunned weapons station of the LVTP7A1 model of the AAV and vehicle ring mounts.
Background: Although the MK 19 is a relatively recent entry into the Army guns inventory, development began in 1963. The first version was a hand-cranked multiple grenade launcher called the MK 18. In 1966, the need for more fire power inspired the development of a self-powered 40-mm machine gun called the MK 19 MOD 0. This model was neither reliable enough nor safe enough for use as a military gun. Product improvements begun in 1971 resulted in the 1972 MOD 1, of which only six were produced. The MOD 1 performed effectively in Navy riverine patrol craft, and broader applications for the MK 19 were found. In 1973, the Navy developed the MOD 2, which featured improved reliability, safety and maintainability. In 1976, a complete redesign resulted in the MK 19 MOD 3, which the Army adopted in 1983. The Army will use the MK 19 within the tactical environment for defense, retrograde, patrolling, rear area security, MOUT, and special operations.AMMUNITION: The MK 19 fires six types of cartridges: M430I / M430A1 high-explosive dual-purpose grenades, M383 high-explosive grenade, M385I / M918 training practice, and M922/M922A1 dummy rounds.

E0989 – M240B Medium Machine Gun

The M240B, is the standard US Marine Corps medium machine gun. The Marine Corps replaced the M60E3 with the M240G and subsequently replaced by the M240B. The ground version of the M240 allows for a common medium machine gun throughout the Marine Corps. The M240B Machine Gun is the ground version of the original M240/M240E1, 7.62mm medium class weapon designed as a coaxial/pintle mounted machine gun for tanks and light armored vehicles. The rate of fire may be controlled by three different regulator settings. The M240G is modified for ground use by the installation of an "infantry modification kit," comprised of a flash suppressor, front sight, carrying handle for the barrel, a buttstock, infantry length pistol grip, bipod, and rear sight assembly.

The M240B is equipped with an integrated optical rail feed cover and a handguard with heat shield to provide thermal protection to the operator.
Manufacturer: Fabrique Nationale Manufacturing, Inc.
Length: 47.5 inches (120.65 centimeters)
Weight: 24.2 pounds (10.99 kilograms)
Bore diameter: 7.62mm (.308 inches)
Maximum effective range: 1.1 miles (1.8 kilometers) on tripod mount
Maximum range: 2.31 miles (3.725 kilometers)
Rates of fire:

  • Cyclic: 650-950 rounds per minute
  • Rapid: 200 rounds per minute
  • Sustained: 100 rounds per minute

Unit Replacement Cost: $6,600