2B1 Oka
2B1 Oka is a Soviet 420 mm self-propelled heavy artillery. 2B1 is its GRAU designation.Development
An experimental model was ready in 1957. Its chassis, was designed and built by the Kirov Plant. Its 20-meter barrel allowed it to fire 750 kg rounds up to 45 km. Due to its complexity of loading it had a relatively low rate of fire—one round every five minutes. Field tests showed various drawbacks of the entire design and the sheer length rendered it incredibly difficult to transport.
Its development continued until 1960, when the idea of such overpowered guns, was abandoned in favor of tactical ballistic missiles, such as the 2K6 Luna.
