The Bofors 40 mm gun, often referred to simply as the Bofors gun, is an anti-aircraft/multi-purpose autocannon designed in the 1930s by the Swedish arms manufacturer AB Bofors.
It was one of the most popular medium-weight anti-aircraft systems during World War II, used by most of the western Allies as well as by the Axis powers.
A small number of these weapons remain in service to this day, and saw action as late as the Gulf War.
In the post-war era the original design was not suitable for action against jet powered aircraft, so Bofors introduced a new model of significantly more power, the 40 mm L/70.
In spite of sharing almost nothing with the original design other than the calibre and the distinctive conical flash hider, this weapon is also widely known simply as “the Bofors”.
Although not as popular as the original L/60 model, the L/70 remains in service to this day, especially as a multi-purpose weapon for light armored vehicles, as on the CV 90.