The BAE Systems Bofors 40 Mk4 is one of the most advanced 40mm naval gun systems in the world, engineered for speed, agility, and versatility in modern naval combat. Designed with lightweight construction and compact dimensions, the Mk4 combines long-range firepower, high survivability, and rapid response against multiple threat types. This makes it suitable for both peacekeeping missions and full-scale naval warfare, where adaptability and reliability are critical.
Overview and Capabilities
At the core of the 40 Mk4 is the 40mm L/70 cannon, the same battle-proven weapon used on the Swedish Army’s CV90 Infantry Fighting Vehicle. This ensures tactical flexibility and operational reliability across different mission profiles. Its key advantage lies in the ability to instantly switch between ammunition types, including the advanced programmable 3P all-target ammunition. With the 3P system, operators can select optimal firing modes such as airburst, impact, or time-fused detonations, enabling engagement of air, surface, and shore-based threats that were once nearly impossible to counter.
The gun system can transition from warning fire to destructive force in under 0.5 seconds, delivering unmatched reaction speed in maritime operations. With a firing rate of 300 rounds per minute and a maximum range of 12.5 kilometers, the Mk4 provides both precision and volume of fire.
Key Technical Features
- Caliber: 40mm L/70
- Weight (excluding ammunition): Under 2,300 kg
- Rate of Fire: 300 rounds per minute
- Muzzle Velocity: 1,012 m/s (with 3P ammunition)
- Barrel Life: Up to 5,000 rounds
- Elevation Limits: -20° to +80°
- Effective Range: 12,500 meters
- Ready-to-Fire Ammunition: 100 rounds (30 + 70), with multiple selectable ammunition types
The gun mount integrates computer-controlled burst firing patterns, an on-mount muzzle velocity radar, and gyro-stabilized local backup controls to ensure reliability even in high-stress combat environments.
Mission Applications
The Bofors 40 Mk4 is designed for a wide spectrum of naval missions, including:
- Peacekeeping Operations – Deterrence through precision warning shots.
- Maritime Law Enforcement – Effective against pirates, smugglers, and asymmetric threats.
- High-Intensity Warfare – Defense against aircraft, anti-ship missiles, and surface vessels.
- Littoral Combat – Superior engagement capabilities in congested coastal environments.
Modern Integration
The Mk4’s electric drive system and fully digitized modular architecture allow seamless integration into modern naval platforms. Its lightweight build makes it suitable for corvettes, patrol vessels, frigates, and other surface combatants without imposing heavy structural or space requirements. Furthermore, the programmable 3P ammunition reduces the need for multiple ammo types, optimizing storage, transport, and logistics.
The BAE Systems Bofors 40 Mk4 represents a new standard in naval artillery, blending high firepower, rapid adaptability, and modern digital systems. With its ability to tackle conventional and emerging threats, it offers navies a cost-effective, multi-role solution that ensures operational superiority across the full spectrum of maritime missions.
