30mm DS30M Mark 2 Automated Small Calibre Gun

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Operação Atlântico 2018 (31993872418).jpg
30mm DS30M Mark 2 fitted on PHM Atlântico
TypeGun turret for autocannon with automated mount or manual control
Place of originUnited Kingdom
Service history
In service2007–present
Used bySee operators
Production history
DesignerMSI-Defence Systems /Alliant Techsystems
Barrel length94.88 inches (2,410 mm)

Caliber30 millimetres (1.18 in) caliber
Muzzle velocity1,080 metres per second (3,500 ft/s) (HEI-T ammunition)
Effective firing range5,100 metres (16,700 ft)

The 30mm DS30M Mark 2 is a ship-protection system made by MSI-Defence Systems consisting of a 30mm Mark 44 Bushmaster II cannon on an automated mount. It was designed to defend Royal Navy frigates from fast inshore attack craft armed with short-range missiles, rocket-propelled grenades, machine guns or explosives.


The DS30M Mark 2 system consists of a 30mm Mark 44 Bushmaster II[1] on a fully automated mount or via manual control[2] with an off-mount electro-optical director (EOD).[2] The gun and the EOD can be controlled from a remote operator console elsewhere on the ship. The weapon is a gyro-stabilized, electrically operated, self-contained, single cannon mount featuring a choice of weapon, control mode and sights. It has low magnetic, radar and Infrared signatures with good availability, reliability and maintainability (ARM).[1] In theory, the dual feed system of the Bushmaster series allows the operator to select different types of ammunition for use against a variety of targets.


In August 2005, the Maritime Gunnery and Missile Systems Integrated Project Team in the UK Ministry of Defence awarded MSI-Defence Systems (part of MS International PLC) a contract to supply a total of 26 Automated Small Calibre Guns (ASCG) systems for retrofit to the 13 Type 23 frigates of the Royal Navy (RN) as part of their littoral Defensive Anti-Surface Warfare upgrade,[2] in a contract was worth more than £15 million (US$30.7 million).[2] The system was bought after Fleet Command and the UK Ministry of Defence's (MoD's) Directorate Equipment Capability identified a gap in capability in the RN's ability to defend itself against swarming fast attack craft threats.[2]

MSI undertook land-based trials at Eskmeals Firing Range in Cumbria.[2] In mid-2007 MSI delivered the first two mountings, which were installed on HMS Somerset in August 2007, and used in sea trials on gun ranges in the English Channel starting in October 2007.[2]

In 2008, the management consultancy company CORDA (part of BAE Systems) was awarded a £300,000 research contract by the UK MoD's Defence Technology and Innovation Centre to assess the level of protection British warships receive from small calibre 30mm guns.[3] CORDA's programme manager said: "What we are doing is looking at the performance of the Royal Navy's 30mm Automated Small Calibre Gun and what can be done to increase the level of protection it provides.'... 'The ASCG system has significantly enhanced capability, but we have been asked to look at how improving tactics or integrating further technology could improve the performance of the system."[3] The study used simulator-based operator trials to quantify the performance of the weapon system when engaging multiple targets in a coordinated attack, at the Maritime Warfare School.[3]

In 2019 a trial was carried out on board HMS Sutherland to test the fitting and operation of Martlet light surface-to-surface missiles on a modified 30mm gun mount. While the tests were deemed successful, there has been no official confirmation about whether the shipboard mounts would go into operational service.[4][5]


 United Kingdom

See also[edit]


  1. ^ a b Global Security Mk 44 Bushmaster II 30/40mm Automatic Cannon / Mk 46 Weapon Station.
  2. ^ a b c d e f g Scott, Richard (30 October 2007). "ASCG enhances Type 23 close-in defence". Janes. Archived from the original on 25 February 2008.
  3. ^ a b c "CORDA – Delivering Successful Futures".
  4. ^ "The Martlet missile – the Wildcat helicopter gets its claws | Navy Lookout".
  5. ^ "Royal Navy test-fires ship-mounted Martlet Lightweight Multi-role Missile | Navy Lookout".
  6. ^ "Supplies – 115077-2016 – TED Tenders Electronic Daily".
  7. ^ "Desider July 2017" (PDF). gov.uk.
  8. ^ Swiftships Orders Build Iraqi Navy’s Coastal Patrol Capabilities.
  9. ^ Naval Technology.com.
  10. ^ Royal Thai Navy Combatant Ship Specification Archived 2016-08-12 at the Wayback Machine, thaiarmedforce.com, 21 January 2010

External links[edit]