2B1 Oka, (Russian: "2Б1 Ока" - "Oka River"), is a Soviet 420 mm self-propelled heavy artillery. 2B1 is its GRAU designation.

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Quick Facts Type, Place of origin ...

2B1 Oka
Type	Self-propelled artillery
Place of origin	Soviet Union
Production history
Variants	See Variants
Specifications
Mass	55.3 t (54.4 long tons; 61.0 short tons)
Height	3 m (9.8 ft)
Main armament	420 mm (17 in) L/47.5
Engine	V12-5 diesel 520 kW (700 hp)

Close

An experimental model was ready in 1957. Its chassis (Object 273), was designed and built by the Kirov Plant. Its 20 m (66 ft) barrel allowed it to fire 750 kg (1,650 lb) rounds up to 45 km (28 mi). 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 (the recoil was too strong for many components: it damaged drive sprockets, ripped the gear-box away from its mountings, etc.) and the sheer length rendered it incredibly difficult to transport.^[1]

Its development continued until 1960, when the idea of such overpowered guns (along with the 2A3), was abandoned in favor of tactical ballistic missiles, such as the 2K6 Luna.

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• List of the largest cannon by caliber