203 mm B-4 Model 1931 Self Propelled Artillery

The 203 mm B-4 Model 1931 is an artillery gun mounted on a tractor chassis. It was nicknamed "Stalin's Sledgehammer" by the Germans. "20.3cm H 503/1 (r)" was the German designation. A variant called the 203 mm B-4M used the same concept but had a 4 wheeled chassis instead, under German designation it was the 20.3cm H 503/2 (r).
Variants:
1.
Name: 203 mm B-4 Model 1931

Type: Self Propelled Artillery
Origin: Soviet Union
Year: 1931
Produced: 871

Length: ???
Width: ???
Height: ???
Weight: 18000 Kilograms
Speed: 14 km/h (5 km/h off-road)

Crew: 10

Primary Armament:
-203 mm B-4
Secondary Armament:
-None

Gun Flexibility:
60° Elevation
0° Depression
8° Left
8° Right

Armor:
???

Sources:
http://www.militaryfactory.com/armor/detail-page-2.asp?armor_id=771