The Bofors Gun is a name that has become synonymous with the Swedish anti-aircraft gun which gained notoriety for its effectiveness during World War II. The gun was designed by Bofors AB and since its initial production, it has undergone several upgrades and modifications to improve its performance. Some of the synonyms for the Bofors Gun include the 40mm Bofors gun, and the Bofors L/60. Other notable synonyms include the "40-mm Automatic Gun M2A1" which was used by the US military and the "Type 59" utilized by the Chinese army. Despite these different names, they all refer to a rapid-firing anti-aircraft gun that was widely used in military warfare.