The SU-12 (russian: СУ-12) self-propelled gun battery ( gun truck) was created in 1934 by the Union of Soviet Socialist Republics by mounting a 76 mm regimental gun M1927 onto a modified GAZ-AAA truck, and was in production from 1933 to 1935. The cannon's barrel and recoil system were modified to reduce recoil. It was the Soviet Union's first self-propelled gun. It had a four-man crew, including the driver, and the gun could rotate 270 degrees. The SU-12 had no armor protection. This was corrected in the SU-1-12 model which added a front shield and roof armor of 4mm thickness. As time went by more armor, in the form of a 2mm rear window and a 4mm rear shield, were added to the SU-1-12 models. Most SU-12 units were decommissioned by 1938, but the Su-1-12 models served in the Battle of Lake Khasan, the Battles of Khalkhin Gol, and in the Winter War against Finland.https://www.flamesofwar.com/Default.aspx?tabid=144&art_id=3999 By 1941 only 3 were left in service and had been supplanted by tracked SPGs.

Other specifications

*fording depth = 0.82 m *obstacle height = 0.75 m *ditch crossing = 2 m *ground pressure = 0.68 kg/cm² *gun elevation = -5°/+25° *gun range of motion = 270°

References

{{Reflist Self-propelled artillery of the Soviet Union World War II self-propelled artillery 76 mm artillery Military vehicles introduced in the 1930s