What is the fastest gun in the world?

The landlord said that to reach the size of the main gun of the tank, we should start with the gun of 100mm, so the appropriate caliber at present is 100mm, 1 14mm, 120mm, 122 mm, France. Russian double-tube AK-20& ltbr & gt& ltbr & gt can achieve higher firing rate, but it will bring many problems. For example, the ammunition supply system must be very complicated, which leads to serious overweight. For example, AK- 130 weighs 35 tons and must be installed on a large platform. Ordinary ground vehicles are definitely not suitable and can only be installed on fixed batteries or large warships. The life of the barrel must be very long, otherwise it will be scrapped after a few hits; In addition, an efficient fire control system is needed, otherwise the high firing rate will seriously affect the accuracy. & ltbr & gt& ltbr & gt This is not worth the loss, so AK- 130 class guns are already the limit from a practical point of view.