Bofors 40 Mk4

The Bofors 40 Mk4 naval gun system is a lightweight multi-purpose naval cannon.^[1][2][3][4] It fires programmable Bofors 40 mm 3P all-target ammunition to engage ships, aircraft, anti-ship missiles and shore targets.^[4][5][6] It is a modern naval version of the Bofors 40 mm L/70۔ The gun can engage targets in less than 0.5 seconds after warning.^[4]

Bofors 40 Mk4
Bofors 40 Mk4 naval gun with on-mount TV camera and muzzle velocity radar on board the Japanese patrol vessel Shunkō
Type	Naval gun
Place of origin	Sweden
Service history
In service	2012–present[1]
Used by	See operators
Production history
Designer	BAE Systems AB
Manufacturer	BAE Systems AB
Produced	2009–present[1]
Specifications
Mass	Empty: 2,300 kilograms (5,100 lb)
Crew	remote controlled with gyro-stabilised local control back-up
Shell	40 × 365 cartridge weight 2.5 kilograms (5.5 lb) shell weight 0.975 kilograms (2.15 lb)
Caliber	40 mm (1.6 in)
Elevation	−20°/+80°
Traverse	360°
Rate of fire	300 rounds/min
Muzzle velocity	1,012 m/s (3,320 ft/s)
Maximum firing range	12,500 m (7.8 miles)
Feed system	Magazine capacity: 100 ready rounds

Ammunition

Bofors 40 mm 3P all-target programmable ammunition allows six modes including three proximity fuzing modes. This increases the flexibility and effectiveness of the gun system, which has further reduced the reaction time of the gun and it is possible to choose ammunition mode at the moment of firing, giving it the ability to switch rapidly between surface targets, air targets, and ground targets.^[7][5][6] Along with the 40 mm 3P, the gun can also fire other Bofors 40 mm L/70 ammunition and has the capability to rapidly switch between ammunition.^[8]

Variants

• Bofors 40 mm Mk 4 L Tridon Mk2: land-based version to install on vehicles such as RMMV HX.^[9]

Users

Current users

• Belgium
  • Belgian Navy
    • City-class mine countermeasures vessel^[1][10]
• Brazil
  • Brazilian Navy
    • Macaé-class patrol vessel: Maracanã, Mangaratiba and Miramar^[11]
• Finland
  • Finnish Navy
    • Hamina-class missile boat^[12]
• Japan
  • Japanese Coast Guard
    • Japanese patrol vessel Shunkō^[13]
• Netherlands
  • Royal Netherlands Navy
    • City-class mine countermeasures vessel^[1][10]
    • Anti-Submarine Warfare Frigate^[14]
• Sweden
  • Swedish Navy^[15]

Future users

• Colombia
  • Colombian Navy
    • Sigma-class design^[16][17][18]
• United Kingdom
  • Royal Navy
    • Type 31 frigate^[1]