OSA-57 Self Propelled Artillery

The OSA-57 was a Soviet self propelled artillery vehicle significantly smaller than the SU-76.
Variants:
1.
Name: OSA-57
Type: Self Propelled Artillery
Origin: Soviet Union
Year: 1943
Produced: 1

Length: 4.8 Meters (With gun)
Width: 2.05 Meters
Height: 1.56 Meters
Weight: 3500 Kilograms
Speed: 35 km/h

Crew: 3

Primary Armament:
-57 mm ZiS-2
Secondary Armament:
-None

Gun Flexibility:
12° Elevation
5° Depression

10° Left
10° Right

Armor:
-Hull
6 mm Front
6 to 4 mm Side
6 mm Rear
-Upper Structure
10 mm Front
6 mm Side
6 mm Rear

Sources:
http://tankarchives.blogspot.ca/2017/03/osa-76.html
http://www.aviarmor.net/tww2/tanks/ussr/osa-76.htm