The gun weighs 16,000 kg (including shield) and the length of the barrel is 6,818 mm.

In 1971, the Finnish national defence committee suggested that the then main current coastal artillery gun (152/50 T) would be replaced by the end of the 1970s.

The Finnish Defence Forces signed a series production contract with Tampella in 1982.

A first attempt to develop sea target shells failed in the 1980s, with the company going bankrupt.

The gun is also fully capable of autonomous operation with its own laser rangefinder and firing solution computer.