The Navy 40mm Bofors anti-aircraft gun, designed by the Swedish company Bofors, was one of the main Allied medium ground anti-aircraft weapons of World War II. Introduced in 1933, the original model was 40 mm  "akan" (automatkanon) M/32, or Bofors 40 mm L/60. 

This anti-aircraft gun is known for its excellent performance and wide use, and was adopted by several navies. The Bofors 40mm anti-aircraft gun combined  Swedish strengths in metallurgy and metalworking to produce a barrel with better ballistic characteristics. By improving the feed and cartridge discharge system, the rate of fire was increased to 130 rounds/min, which was already very good for a 40 mm gun.

 The Bofors 40mm anti-aircraft gun performed well in the Belgian shooting competition in 1935. Its ballistic characteristics  and the speed of barrel adjustment was superior to other guns of the same type. The hit rate was three times that of the British anti-aircraft gun, and it was highly manueverable on the battlefield, winning the praise of and subsequent purchase by French Army representatives.

 The design of this antiaircraft gun allows for rapid fire and high maneuverability, making it very effective on the battlefield. The projectiles include high explosive, armor piercing, training projectiles, etc., which can deal with a variety of air threats. The Bofors 40mm anti-aircraft gun had a maximum range of 4.75 km and a theoretical rate of fire of 80 to 160 rounds per minute, which was powerful enough to destroy almost any aircraft of World War II design. Such anti-aircraft guns were not only widely exported, but also licensed for production. It was widely imitated or even improved elsewhere, and became a weapon for both the Allied and Axis camps in World War II. Because of its excellent performance, the Bofors 40mm anti-aircraft gun made great contributions to the British war effort during World War II, especially in the Battle for Britain. It became the mainstay of the British Army's short-range air defense, where British anti-air batteries armed with it earned the nickname "The Bofors Boys"

Zimi Models is releasing the kit alone and other 3D printed accessories which include 8 sets of soldiers (with and without life jackets), shell shells, and quadruple loading magazines.