6-inch siege gun M1904

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6-inch siege gun model 1904
Russian siege gun model 1904 displayed in front of Coastal Artillery Museum in Suomenlinna fortress, Helsinki.
Type	siege gun
Place of origin	Russian Empire
Specifications
Weight	combat: 5,437 kg
Barrel length	30 calibers

Caliber	152.4 mm
Carriage	box trail
Elevation	-3.5° to 40.2°
Muzzle velocity	623 m/s
Maximum range	14.2 km

6-inch siege gun model 1904 (Russian: 6-дюймовая осадная пушка образца 1904 года) was a Russian 152.4 mm heavy siege gun. It was produced by Perm Works, a total of about 200 pieces were built.

The gun was utilized in World War I, Russian Civil War and some conflicts of the early 20th century where former parts of Russian empire were involved. It remained in the Red Army inventory, but from early 1930s was being gradually replaced by newer 152-mm gun M1910/30 and 152-mm gun M1910/34 and was retired for good after the 152-mm howitzer-gun model 1937 (ML-20) was adopted.

A few guns were captured by Finland in the Civil War. Those pieces were apparently used in Winter War and Continuation War.

Surviving pieces can be seen in Hämeenlinna and Suomenlinna Artillery Museums, Finland.