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This proved to leave heavy zinc deposits in the barrel, and had to be abandoned.In the summer of 1930 experiments were made with a new test gun that did away with controlled feed and instead flicked the spent casing out the rear whereafter a second mechanism reloaded the gun by "throwing" a fresh round from the magazine into the open breech.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, especially as a multi-purpose weapon for light armoured vehicles, as on the CV 90.Bofors has been part of BAE Systems AB since March 2005.The rate of fire was normally about 120 rounds per minute (2.0 rounds per second), which improved slightly when the barrels were closer to the horizontal as gravity assisted the feeding from the top-mounted magazine.

The Navy approached Bofors about the development of a more capable replacement. Bofors produced a gun that was a smaller version of a 57 mm (6-pounder) semi-automatic gun developed as an anti-torpedo boat weapon in the late 19th century by Finspong.The trainer and layer were both provided with reflector sights for aiming, while a third crew-member standing behind them "adjusted" for lead using a simple mechanical computer.Power for the sights was supplied from a 6V battery.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.

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