Anyone who has ever watched how domestic tanks are firing could have noticed one very an interesting feature: after firing a shot, the tank's gun rises up and remains in this position for a while. Are the tankers themselves doing the lift or is there some kind of automatic system in the combat vehicle? Why is this done?
When domestic tanks T-72, T-80 and T-90 (as well as their numerous modifications) make a shot from a cannon, then after it, the gun rises slightly up for a few seconds and lingers for a short time in this position. After that, the gun returns to its original position. In fairness, it should be added that a similar action is performed by the guns not only of Russian tanks, but also of many foreign ones. To be convinced of this, it is enough to carefully observe how at least the British "Challenger-2" fires.
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The cannon rises not at all at the whim of the tankers and not for beauty. This fraud is carried out as a result of a "natural" loading process and is a consequence of the automatic mechanism of loading shells into the barrel. The lifting of the gun occurs due to the fact that it must take a very specific position during the reload cycle. This is necessary so that the automatic mechanism could do its job and put the projectile at the ready.
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Of course, the tank's gun can be lowered higher or lower depending on the conditions of fire, the range of the target, its speed and position in space. It is noteworthy that if the tank's gun was raised above the relative norm, then in most situations the automatic mechanism during reloading, it will not raise the muzzle even higher, since it will already be in a convenient place for sending a projectile position.
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A source: https://novate.ru/blogs/080420/54076/