MSI-Defence Systems

MSI-Defence Systems builds the small calibre gun mounts that sit on the deck edge of a warship and deal with whatever gets close. The company works from a sixteen thousand square metre site on Salhouse Road in Norwich, with a United States operation at Rock Hill in South Carolina, and forms the defence division of MS International, an AIM-listed group whose other divisions have nothing to do with weapons. Around a hundred and fifty people work there. Design, manufacture, integration and in-service support all happen under one roof, which is unusual at this size and is a large part of why the business has held on to sovereign gun mount work that larger primes would happily take.

SEAHAWK is the core product family. The DS range arms vessels of thirty metres and upward with a 25mm, 30mm or 40mm cannon, serving as the main gun on patrol craft and as a close-in secondary on frigates and destroyers, and is offered in A1, A2 and remote-operated forms. The lightweight LW range takes a 14.5mm heavy machine gun or a 25mm or 30mm cannon for smaller hulls and constabulary tasks. SEAHAWK A3 and the SEAHAWK MWS mount sit alongside them. The best known installation is the DS30M Mark 2 Automated Small Calibre Gun, a 30mm Bushmaster II on a stabilised mount, which the Royal Navy adopted to defend frigates against fast inshore attack craft and bought in quantity, including a contract for twenty-six systems to retrofit thirteen Type 23 frigates. The type went on to arm Type 45 destroyers and the Type 26 programme, and SEAHAWK variants are in service or on order with well over a dozen navies worldwide.

The land side grew out of the same stabilised mount and fire control engineering. TERRAHAWK is the family name. The remote weapon station version covers littoral and land vehicle applications, while TERRAHAWK VSHORAD is a rapidly deployable very short range air defence and counter-drone system that can be vehicle-mounted or ground-emplaced and fought remotely so the operator is not stood behind the gun. The modular and remote weapon station line supplies mounts, fire control and sensors as a package for vehicles and uncrewed platforms.

Sensor and stabilisation work supports both domains, including electro-optical targeting sights and stabilised radar mast structures. Support services run to spares, training, repair and upgrade across the installed base, which matters more than usual for a company whose products spend their lives in salt spray. The commercial picture is unusual too. Most of the revenue comes from outside the United Kingdom, the United States Navy has been a long-running customer for 30mm gun systems, and the business has continued to invest in Norwich manufacturing while much comparable British capacity has closed or moved abroad. Scale cuts both ways here. A parent listed on a junior market and a headcount in the low hundreds mean the company cannot chase every programme, but it also carries none of the overhead a prime would load onto a deck gun, and the design authority for the mount, the stabilisation and the fire control sits with the same team that welds it together. Buyers dealing with MSI-DS are dealing with the engineers.