130 mm/55 B7 Pattern 1913

130mm/55 Pattern 1913 naval gun B7
Type	Naval gun
Place of origin	Russian
Service history
In service	1914–1945?
Used by	Russia; Soviet Union
Wars	World War I, World War II
Production history
Designed	1912
Manufacturer	Obukhov State Plant, Vickers Ltd.
Produced	1913 - 1925
No. built	571
Specifications (Pattern 1913)
Mass	5,290 kg (11,660 lb) (gun only)
Length	7,150 mm (281 in)
Barrel length	7,019 mm (23 ft 0.3 in) (bore) 5,862 mm (19 ft 3 in) (rifling)
Shell	HE mod 1911
Shell weight	36.86 kilograms (81.3 lb)
Caliber	130 mm (5.12 in)
Breech	Welin breech block
Recoil	Hydro-spring
Elevation	-5° / + 30°
Traverse	360°
Rate of fire	5-8 shots/minute
Muzzle velocity	861 m/s (2,820 ft/s)
Maximum firing range	20,300 m (22,200 yd)

The 130mm/55 B7 Pattern 1913 naval gun was a 5.1-inch naval gun used predominantly on ships of the Imperial Russian Navy and later by the Soviet Navy. It was manufactured mainly by the Obukhov State Plant (OSP) in St. Petersburg, as well as under licence by Vickers Limited in Great Britain. The gun was used as medium artillery on several Russian dreadnoughts and as main artillery on cruisers, as well as coastal artillery. It was succeeded by the 130 mm/50 B13 Pattern 1936 naval gun, which became the standard destroyer gun of the Soviet Navy during World War II.