In service with several Russian warships since 1978, the AK-100 is a 100 mm automatic water-cooled naval artillery system that is designed to engage naval, aerial, and land targets. The AK-100 can accept various ammunition, including ammunition with proximity fuzes, high explosive ammunition, and armor piercing ammunition. The system can also engage anti-ship missiles. The AK-100 has a range of over 20 km, and has a firing rate of 30-50 rounds per minute. The AK-100 has an elevation of -10 / +85 degrees and weighs roughly 35 tons. The AK-100 can be manually controlled, or via a control system that comprises of an electronic TV targeting system and a computer. The firing rate is adjustable from single shot to fully automatic.