Mk44 Bushmaster II

Last updated

Mk44 Bushmaster II
CV9030 turret.jpg
Finnish CV 9030 with Mk44
Type Chain gun autocannon
Service history
In service2007–present
Used bySee users
Production history
Designer Alliant Techsystems
Manufacturer Northrop Grumman
Specifications
Mass344  lb (160  kg)
Length134.05 inches (3,405 mm)
Barrel  length94.88 inches (2,410 mm)
Width13.5 inches (340 mm)
Height15.43 inches (392 mm)

Shell 30×173mm
40×180mm
Caliber 30 millimetres (1.18 in) caliber
40 millimetres (1.57 in) caliber
Rate of fire 100/200 rounds per minute
Muzzle velocity 1,080 metres per second (3,500 ft/s) (HEI-T ammunition)
Effective firing range3,000 metres (9,800 ft) land appl.
5,100 metres (16,700 ft) naval appl.

The Mk44 Bushmaster II is a 30 mm chain gun manufactured by Northrop Grumman. It is a derivative of the 25 mm M242 Bushmaster, and uses 70% of the same parts as the M242 while increasing the firepower by as much as 50% with the 20% increase in caliber size. The barrel is chromium-plated for extended life. The gun uses standard GAU-8 Avenger ammunition that is available in API (Armor-Piercing Incendiary), HEI (High-Explosive Incendiary) and APFSDS-T (Armor-Piercing Fin-Stabilized Discarding Sabot-Tracer) variants.

Contents

The gun can be converted to a caliber of 40×180 mm, which involves changing the barrel and a few key parts, to use the SuperShot 40 cartridge. It can also be converted to use the 30×170 mm RARDEN cartridge.

History

The Bushmaster II is the standard primary armament of the Bionix-II AFV currently in service with the Singapore Army, the KTO Rosomak in Polish service, and the CV90 AFVs in Finnish, Norwegian and Swiss service. Although the United States Air Force selected this cannon to replace the 25 mm GAU-12 Equalizer and Bofors 40 mm Automatic Gun L/60 guns on its fleet of AC-130U gunships in 2007, this plan was later canceled. [1] The United States Marine Corps' cancelled Expeditionary Fighting Vehicle, was expected to be armed with this cannon as well. Some United States Navy vessels, such as the new San Antonio-class amphibious transport dock are armed with the Bushmaster II for surface threat defense.

The Bushmaster II cannon is used in the DS30M Mark 2 Automated Small Calibre Gun (ASCG) point defense system that is fitted to the Royal Navy's Type 23 frigates. [2]

The Bushmaster II cannon is also used in the Turkish made Aselsan SMASH stabilized weapon station. [3]

The USAF had experimented with installing Bushmaster II cannons on their AC-130U gunships in place of the GAU-12 and Bofors 40 mm cannons. On 11 August 2008, the effort was canceled because of problems with the Bushmaster's accuracy in tests "at the altitude we were employing it." There were also schedule considerations that drove the decision. [4] On 9 July 2012, the Air Force type classified a new version of the Bushmaster called the GAU-23/A. The cannon will be used on the AC-130W and the AC-130J gunships. [5]

Mk 46 Mod 2 GWS aboard San Antonio-class amphibious transport ship Green Bay, 2016. The amphibious transport dock ship USS Green Bay (LPD 20) fires a MK-46 30mm gun during a live-fire exercise (28540439144).jpg
Mk 46 Mod 2 GWS aboard San Antonio-class amphibious transport ship Green Bay, 2016.

The U.S. Navy uses the Mk44 Bushmaster II in the Mk 46 Mod 2 Gun Weapon System (GWS). The GWS is produced by General Dynamics to give warships protection against small, high-speed surface craft. A Mk 46 turret consists of the 30 mm chain gun, a forward looking infrared (FLIR) sensor, a low light television camera, and a laser rangefinder. The guns fire at 200 rounds per minute and are fed by a 400-round magazine through 200-round dual feeds. Effective range is 2,200 yd (2,000 m) for full-caliber high-explosive or armor-piercing ammunition, which can be extended when using sub-caliber rounds. The Mk 46 GWS is permanently installed on the San Antonio-class amphibious transport dock and can be installed on Freedom and Independence-class littoral combat ships as part of the surface warfare (SuW) package. [6] [7] In 2012, the Navy decided to replace the Mk 110 57 mm cannons on Zumwalt-class destroyers with the Mk 46 GWS. [8]

Orbital ATK developed a modified version of the Bushmaster II, known as the Mk44 STRETCH, which can fire the 30x173 mm Mk310 PABM-T airburst round. [9] [10]

In January 2020, Northrop Grumman revealed the development of proximity airburst rounds for the LCS' 30 mm gun modules to destroy small unmanned aerial vehicles (UAVs). Since the modules feature dual feeders, different types of rounds could be fed for different targets. [11]

In October 2023, the UK announced it would be delivering the Terrahawk Paladin to Ukraine as part of assistance during the Russian invasion of Ukraine. The Terrahawk Paladin is made by MSI Defence Systems (MSI-DS) as a land-based version of the Seahawk. It is a static Very Short-Range Air Defense (VSHORAD) Counter Unmanned Aerial Systems (C-UAS) system that can be deployed off a truck. The system combines radars, EO/IR cameras, and laser rangefinders with a 30 mm Mk44 Bushmaster II chain gun with 240 rounds of airburst munitions capable of engaging small UAS out to 2 km (1.2 mi). [12] [13] [14]

XM813

The XM813 Bushmaster is based on the Mk44 and is offered as an upgrade for U.S. Army M1126 Stryker and M2 Bradley vehicles, as well as having been a contender to be the primary armament of the Ground Combat Vehicle. The improvements include a 25.4 mm (1.00 in) longer barrel, integral mount to increase first round hit probability by up to 10%, a dual recoil system to enhance accuracy to help cope with future hotter propellants, and a Meggitt linkless dual feed ammunition system. [15] The 30 mm chain gun can fire Mk310 Programmable Air Burst Munition rounds to attack targets in defilade. The United States Army Research, Development and Engineering Command helped enhance the XM813 mainly for safety and turret integration. By changing five parts, the gun caliber can be increased to 40 mm. As of November 2013, the XM813 was being tested at Aberdeen Proving Ground over three months to ensure reliability levels of 40,000 mean rounds between failures. Long-term plans are to equip vehicles with the Bushmaster III 35mm/50mm cannon. [16] [17]

The XM813 was demonstrated in September 2014 at the ARDEC Digital Multi-Purpose Range Complex. The gun was mounted on a Bradley Fighting Vehicle and fired at targets up to 1,500 metres (0.93 mi) away. An enhanced fire control system improves long-range accuracy to kill targets with fewer bursts, sometimes as few as two or three rounds instead of 10. The XM813 30 mm cannon is intended to replace the M242 Bushmaster 25 mm chain gun, and can be mounted on vehicles other than the Bradley. Two capabilities not demonstrated were its linkless ammunition with airburst capabilities; airburst rounds increase lethality by enabling engagement of targets in defilade when they would otherwise only be suppressed by fire. [18]

In early 2015, the U.S. Army approved an upgrade for 81 Stryker vehicles of a Stryker Brigade Combat Team deployed in Europe to be upgunned with the Mk44 30 mm Bushmaster cannon to increase their lethality against other light armored vehicles used by Russia in the theater. [19] The cannons will be installed by 2018, and may be the first step in adding the Bushmaster to the entire active fleet of about 1,000 Strykers; [20] the XM813 variant will be used with the Strykers. [21] The XM813 has a demonstrated firing ability out to 3,000 metres (1.9 mi) for precision firing, nearly twice as far as the M2 12.7 mm caliber machine gun that has a maximum effective range of 1,830 metres (1.14 mi) as an area suppression weapon. The first upgunned Stryker, known as the "Dragoon" for the 2nd Cavalry Regiment the vehicles will be part of, was delivered in October 2016, [22] [23] and the first Infantry Carrier Vehicle - Dragoon (ICVD) was delivered to the 2CR in Germany in December 2017. [24]

The ATK MK44-ABM variant of the Bushmaster was selected in 2018 by the Spanish Army to equip the Tizona turret of the Line version (IFV) of the Dragón IFV, the replacement of the Pegaso BMR. [25]

Users

Pandur II, Dny NATO 2013 (1).JPG
RCWS-30 mount on Czech Pandur II.
AC-130U Spooky gunship 30 mm cannon.jpg
AC-130U with a trial installation of two Mk 44 weapons.
Cav Shoot Glen of Imaal (11797611804) (2).jpg
Irish Mowag Piranha shooting Mk 44 Bushmaster II.
Zhong Hua Min Guo 110Nian Guo Qing Da Hui Zhong Zhan Chu Zhi CM-34Zhuang Bu Zhan Dou Che .jpg
Taiwan CM-34 with 30 mm Mk44 Bushmaster II cannon
KTO Rosomak. Anakonda-12 x.jpg
Polish KTO Rosomak with 30 mm Mk44 Bushmaster

30 mm cannons

Flag of Argentina.svg  Argentina

Flag of Australia (converted).svg  Australia

Flag of Botswana.svg  Botswana

Flag of Brazil.svg  Brazil

Flag of Bulgaria.svg  Bulgaria

Flag of Croatia.svg  Croatia

Flag of the Czech Republic.svg  Czech Republic

Flag of Finland.svg  Finland

Flag of Ghana.svg  Ghana

Flag of Indonesia.svg  Indonesia

Flag of Japan.svg  Japan

Flag of Ireland.svg  Ireland

Flag of Italy.svg  Italy

Flag of Lithuania.svg  Lithuania

Flag of the Netherlands.svg  Netherlands

Flag of Norway.svg  Norway

Flag of the Philippines.svg  Philippines

Flag of Poland.svg  Poland

Flag of Portugal.svg  Portugal

Flag of Romania.svg  Romania

Flag of Saudi Arabia.svg  Saudi Arabia

Flag of Singapore.svg  Singapore

Flag of Spain.svg  Spain

Flag of Switzerland (Pantone).svg   Switzerland

Flag of the Republic of China.svg  Taiwan

Flag of Thailand.svg  Thailand

Flag of Ukraine.svg  Ukraine

Flag of the United Kingdom.svg  United Kingdom

Flag of the United States.svg  United States

Munitions

30 x 173 munitions 30 x 173mm Caliber Ammunition -b.jpg
30 x 173 munitions
nameshort descriptionnotes
MK238 High Explosive Incendiary-Tracer (HEI-T)This round self-destructs if it misses its target. [49]
MK239 Target Practice Traced (TP-T)training ammunition, ballistically matched with the MK264. [50]
MK258 Armor Piercing, Fin Stabilized, Discarding Sabot-Tracer (APFSDS-T)The round is designed to be "supercavitating" to increase its effectiveness when fired at targets like underwater mines. [51]
MK264 Multi Purpose Low Drag-Tracer(MPLD-T)Light armor-piercing capability with a delayed explosive reaction using a chemical fuze. It is available with and without Self Destruct (SD).
MK266 High Explosive Incendiary-Tracer (HEI-T)An update to an earlier round, with enhanced range. [52]
MK310 Programmable Air Burst Munition-Tracer (PABM-T)Can be programmed to explode in the air above target to wound or kill enemies behind cover. [53]
MK317 Target Practice Discarding Sabot-Tracer (TPDS-T)A training round. [54]
PGU14/B Armor Piercing Incendiary (API)A relatively lightweight projectile with a core of dense depleted uranium penetrator. [55]
PGU13D/B High Explosive Incendiary (HEI)Aircraft mounted cannons use the round against personnel, trucks, ammunition storage, and other targets. [56]
PGU15A/B Target Practice (TP)A training round with the same ballistic properties of PGU13D/B. [57]

See also

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<span class="mw-page-title-main">Alliant Techsystems</span> American aerospace, defense, and arms firm (1990–2015)

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References

Notes
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  57. Pike, John (9 January 1999). "PGU-15/B TP Target Practice 30mm Ammunition". Federation of American Scientists . Retrieved 22 October 2020. The PGU-15/B TP Target Practice projectile simulates the exterior ballistics and provides a ballistic match to the HEI round and is used for pilot training.