Famous Swedish Bofors 40 mm anti-aircraft gun used by all sides in World War Two. (Once war came countries which could not get them directly from Sweden manufactured them under license. The gun above is being manned by British troops).
Domestically produced British anti-aircraft manufactured from British designs lacked the effectiveness and versatility of the Bofors 40mm.
A group of Finnish soldiers operating a Bofors gun during the Continuation War, Suulajärvi