M1128 Mobile Gun System

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M1128 Mobile Gun System
Exercise Allied Spirit I, Day 5 150117-A-EM105-337.jpg
A M1128 Mobile Gun System during a training exercise in 2015
TypeAssault gun
Armored fighting vehicle
Place of originUnited States
Service history
WarsIraq War[1]
Production history
ManufacturerGeneral Dynamics Land Systems[2]
No. built142[2]
Mass18.77 tonnes (20.69 short tons; 18.47 long tons)
Length6.95 m (22.92 ft)
Width2.72 m (8.97 ft)
Height>2.64 m (>8.72 ft)[3]

Armor14.5 mm resistant[4]
M68A1E4 105 mm cannon
M2 .50 caliber machine gun; M240C coaxial machine gun; 2, M6 smoke grenade launchers
EngineCaterpillar C7 turbo diesel
260 kW (350 hp)
Power/weight18.65 hp/ton
TransmissionAutomatic 6 forward, 1 reverse
Suspension8×8 wheeled
Ground clearance15 in (38 cm)
Fuel capacity56 gallons (212 liters)
330 miles (528 km)
Maximum speed 60 mph (96 km/h)

The M1128 Mobile Gun System is an eight-wheeled armored car of the Stryker armored fighting vehicle family, mounting a 105 mm tank gun, based on the Canadian LAV III light-armored vehicle manufactured by General Dynamics Land Systems. It is in service with the United States Army[5] but will be retired by the end of 2022.[6]



Mobile Gun System firing

The MGS's low profile turret has a small silhouette, is stabilized and mounts a 105mm M68A1E4 rifled cannon with a fume extractor and an autoloader. The vehicle is primarily outfitted to support infantry combat operations; while it could take on some of the roles of a tank, it is not designed to engage in combat with tanks. The MGS can store 18 rounds of main gun ammunition, 8 in the autoloader's carousel and an additional 10 in a replenisher located at the rear of the vehicle.[7] It has a rate of fire of ten rounds per minute.[8]

The MGS's 105 mm cannon can fire four types of ammunition: the M900 kinetic energy penetrator to destroy armored vehicles; the M456A2 high explosive anti-tank round to destroy thin-skinned vehicles and provide anti-personnel fragmentation; the M393A3 high explosive plastic round to destroy bunkers, machine gun and sniper positions, and create openings in walls for infantry to access; and M1040 canister shot for use against dismounted infantry in the open.[9][10]

Crew amenities[edit]

Because the vehicle was originally designed without air conditioning (A/C), crews were given cooling vests that circulate cooled water from outside the vehicle to the garment. Vehicle computers still overheated regularly. All MGS Stryker platforms have since been upgraded with A/C units.[11] The large weapon station and relatively smaller hatch can make emergency exits difficult.[1] Because the main cannon is separated from the crew compartment a gun stoppage during combat can only be cleared by disembarking from the vehicle.[citation needed]


The U.S. Army allocated nine Mobile Gun Systems to a battalion.[1] There were 27 Mobile Gun Systems per "Stryker brigade" in 2013, but later the Army cut the number per brigade to 10.[12] The Army bought 142 Mobile Gun Systems in total;[13] 3 were lost in combat. A three-vehicle MGS platoon operates organic to a Stryker infantry company, with one MGS in support of a Stryker infantry platoon.[14]

As of May 2017, a Stryker brigade combat team is equipped with three platoons of MGS Strykers and three platoons of ATGM Strykers in its weapons troop.[15]


A Mobile Gun System and other Strykers shortly before being flown into Afghanistan in 2008


In course of the Armored Combat Vehicle Technology (ACVT) Program, both the U.S. Army and the Marine Corps have let separate fixed price vehicle design study contracts to nine contractors. The nine contractors were: Alvis Ltd, Cadillac Gage, General Motors of Canada, Pacific Car and Foundry, Bell Aerospace, FMC Corporation, Chrysler (jointly with General Dynamics), Teledyne and AAI Corporation. The gun, officially designated as the medium caliber anti-armor automatic cannon (MCAAAC), had been already developed by Ares Inc.[16] During development the original Ares Inc. made replenisher proved to be problematic and was replaced with one made by Meggitt Defense.[17]


Following the end of the Cold War some theorists believed that the existing suite of U.S. armored vehicles, designed largely to fight Soviet mechanized forces in Europe, were not well suited to the lower-intensity missions U.S. armed forces would be tasked with. This led to the development of a new armored fighting vehicle designed for lower-intensity combat, rather than large-scale battle.[citation needed]

Canada had liquidated about half of its fleet of Leopard 1s in the early 2000s, with the intention of replacing them with the Mobile Gun System, but the decision was reversed.[18]

Full-rate production was indefinitely deferred as of 2012.[19]

In late 2013, the U.S. Army began seeking to reintroduce an airdroppable mobile airborne protected firepower platform to provide fire support for air assault forces, a capability that had been absent since the retirement of the M551 Sheridan in 1997. General Dynamics initially considered modifying the wheeled Stryker MGS to meet the requirement,[12][20] but the company instead developed the tracked Griffin light tank technology demonstrator as its offering for the Mobile Protected Firepower (MPF) platform, which was unveiled in October 2016.[21]


On 12 May 2021, the Army announced they would divest all Stryker Mobile Gun Systems by the end of 2022. The decision was made following an analysis that found its autoloader had become expensive to maintain and that the M1128 hadn't been upgraded with a Double V-Hull, and that it was more efficient to eliminate the platform and focus on firepower improvements such as equipping Strykers with 30 mm cannons and CROWS-J mounts, providing better distributed lethality capabilities that won't be lost from removing the MGS.[6][22]

See also[edit]


  1. ^ a b c Matthew Cox (4 February 2008). "Mobile Gun System brings the heat in Iraq". Gannett Government Media Corporation. Archived from the original on January 17, 2013. Retrieved 28 August 2011.
  2. ^ a b Green, Michael (22 Nov 2016). American Wheeled Armoured Fighting Vehicles. South Yorkshire, United Kingdom: Pen & Sword Books Ltd. p. 192. ISBN 1473854369. Retrieved 28 May 2020.
  3. ^ "Equipment: Mobile Gun System vs. Leopard tank". cbc.ca.
  4. ^ "Army Fact File – Stryker". Retrieved 2008-04-16.
  5. ^ Soldiers train on Stryker gun system
  6. ^ a b The Army Is Ditching All of Its Stryker Mobile Gun Systems. Military.com. 12 May 2021.
  7. ^ "Stryker mobile gun system replenisher". Meggitt Defense. Retrieved 30 July 2018.
  8. ^ Ogg, David (2001-06-18). "The Road To The Objective Force "Armaments for the Army Transformation"" (PDF). Firepower Symposium: 32.
  9. ^ M1128 Stryker Mobile Gun System - Globalsecurity.org
  10. ^ "Archived copy" (PDF). Archived from the original (PDF) on 2014-08-26. Retrieved 2014-08-22.CS1 maint: archived copy as title (link)
  11. ^ "PM (Preventive Maintenance) Keeps Strykers Combat Ready!" (PDF). Logistics Support Activity. Retrieved 30 July 2018.
  12. ^ a b Matthew Cox (20 September 2013). "Army Looks to Mount 30mm Cannons on Strykers". Military.com. Retrieved 22 September 2013.
  13. ^ Uparmored Bradley Could Be Tough Enough For AMPV: Testers - Breakingdefense.com, 29 January 2014
  14. ^ Stryker Mobile Gun System (MGS) Archived 2014-10-19 at the Wayback Machine – Office of the Director, Operational Test & Evaluation. 2013
  15. ^ "Stryker Brigade Combat Team Weapons Troop" (PDF). Army Publishing Directorate. Retrieved 30 July 2018.
  16. ^ Department of Defense Appropriations for 1983, pt. 5, p. 791.
  17. ^ Ayers, Christian. "The Stryker Mobile Gun System; A Case Study on Managing Complexity" (PDF). Defense Technical Information Center. Retrieved 30 July 2018.
  18. ^ Major Howard Mark Anthony, Close Combat Vehicle and Leopard 2 Main Battle Tank: Back in the Heavyweight Fight, Canadian Forces College, pg 13, Footnote 21, https://www.cfc.forces.gc.ca/259/290/298/286/anthony.pdf Accessed 2019-11-17
  19. ^ Brannen, Kate. "AUSA: U.S. Army Plans Post-War Management of Stryker Fleet." Defense News. February 23, 2012.
  20. ^ U.S. Army in the Market for ‘Light’ Tanks Archived 2016-01-19 at the Wayback Machine - Nationaldefensemagazine.org, 7 October 2013
  21. ^ General Dynamics presents new Griffin technology demonstrator of light tank for U.S. airborne troops - Armyrecognition.com, 5 October 2016
  22. ^ US Army scraps Stryker mobile gun systems in favor of new lethality upgrades. Defense News. 12 May 2021.

External links[edit]

Media related to Stryker Mobile Gun System at Wikimedia Commons