A prototype version armed with a 100 mm gun; it went into trials against the IS-122 which was armed with a 122 mm gun. Though the IS-100 was reported to have better anti-armor capabilities, the latter was chosen due to better all-around performance.

The ISU-122 (acronym of Istrebitelnaja - or Iosif Stalin-based - Samokhodnaya Ustanovka 122) was a Soviet assault gun used during World War II, mostly in the anti-tank role.

The IS-122 prototype replaced the IS-85 and began mass production as the IS-2. The 85 mm guns could be reserved for the new T-34-85 medium tank and some of the IS-1s built were rearmed before leaving the factory and issued as IS-2s.

2014年6月30日 · An up-gunned version of the IS-1, the IS-2 was the main Russian heavy tank of 1944, replacing the KV-1 and variants. It was armed with a 122 mm gun.

2016年5月5日 · The ISU-122 was a heavy self propelled gun, and de facto tank destroyer. The vehicle came to be because the Soviets were able to produce ISU-152 hulls faster than they could produce their 152 mm (6 in) ML-20S armament.

2013年7月3日 · The tank was accepted under the index IS-122. Production IS-122s differed from the trial version by a D-25T gun with a horizontal semi-automatic sliding breech, which increased the rate of fire. Modifications to increase the rate of fire were carried out throughout the tank's life.

An up-gunned version of the IS-1, the IS-2 was the main Russian heavy tank of 1944, replacing the KV-1 and variants. It was armed with a 122 mm gun.

2009年8月25日 · The application of tanks IS -122 and self-propelled units ISU-152 in front of the battle formations of medium tanks and infantry as the fixed instruments on the front edge or in the defence zone is forbidden.

2023年9月13日 · Early variant has a more round cast hull, while the later variant is more simplified and angled. The later variant also has a different drivers view port and lacks hull mounted fixed machine guns, that the early model had for some reason. There were more differences but these are the most obvious ones.

2021年5月11日 · On the basis of the IS-2, since April 1944, the heavy tank destroyer ISU-122 was produced, armed with a 122-mm A-19C cannon (which is identical in ballistics to the D-25T, but has larger recoil devices and is not equipped with a muzzle brake).