180mm Pattern 1931-1933

180mm Pattern 1931-1933
MK-1-180 single turrets aboard the Soviet light cruiser Krasnyi Kavkaz
Type	Naval gun Coastal artillery Railway gun
Place of origin	Soviet Union
Service history
In service	1931 - 1990s
Used by	Soviet Union
Wars	World War II
Production history
Designed	1929
Produced	1931-1933
Variants	180mm/60 Pattern 1931 180mm/57 Pattern 1932 180mm/56 Pattern 1933
Specifications
Mass	17–18.5 t (18.7–20.4 short tons)
Length	10.2–10.6 m (33–35 ft)
Barrel length	8–8.2 m (26–27 ft)
Shell	Separate loading bagged charge and projectile
Shell weight	97.5 kg (215 lb)
Caliber	180 mm (7.1 in) 56-60 Caliber
Elevation	Single naval mounts: -5°to +60° Triple naval mounts: -5° to +50° Coastal & Rail mounts: -0° to +50°
Rate of fire	4-5 rpm
Muzzle velocity	900 m/s (3,000 ft/s)
Maximum firing range	37.1–38.5 km (23.1–23.9 mi) at +50°[1]

The 180mm Pattern 1931-1933 were a family of related naval guns of the Soviet Navy in World War II, which were later modified for coastal artillery and railway artillery roles. They were the primary armament of the Soviet Union's first cruisers built after the Russian Civil War.