30mm DS30M Mark 2 Automated Small Calibre Gun

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, rockets, rocket-propelled grenades, heavy machine guns or explosives. It replaced in this role the 30mm Oerlikon KCB gun on the DS30B, a similar powered mounting. The DS30M has also been added to patrol boats and corvettes for the Iraqi and Omani navies respectively.

The DS30M Mark 2 system consists of a 30mm Mark 44 Bushmaster II on a fully automated mount with an off-mount electro-optical director (EOD). The gun and the EOD are controlled from a remote operator console elsewhere on the ship. The "mount is a single cannon naval mount that is gyro stabilized, electrically operated and self contained gun mounting featuring a choice of cannon, control mode and sights. It has low magnetic, radar and IR signatures and excellent ergonomic availability, reliability and maintainability (ARM)." In theory "the unique dual feed system of the Bushmaster series allows the operator to select different types of ammunition for use against a variety of targets. The safety, reliability and low life-cycle costs of the Bushmaster system added to its overall value." However photographs show only a single ammunition feed.

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 ASCG systems for retrofit to the RN's 13 Type 23 frigates as part of the wider littoral Defensive Anti-Surface Warfare (ASuW) upgrade programme." This contract is worth more than £15 million (USD30.7 million) to MSI. The system is being bought because "Fleet Command and the UK Ministry of Defence's (MoD's) Directorate Equipment Capability (Above Water Effect) - DEC(AWE) - have identified a significant capability gap in the RN's ability to defend itself against fast attack craft and 'swarming' fast inshore attack craft threats in the littoral. The latter include powerboats, interceptors, rigid inflatables and jet-skis variously equipped with short-range missiles, rockets, rocket-propelled grenades, heavy machine guns or explosives."

MSI undertook land-based trials at Eskmeals Firing Range in Cumbria. 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 in starting in early October 2007.

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