The self-propelled gun "Vena" is already used by Russia. Work of the gun crew

The Russian 120-mm self-propelled artillery and mortar unit has appeared in the army. It is not yet clear whether the Vena self-propelled guns began to be mass-produced or not; instead, the Russian army began modernizing the Nona self-propelled guns. An experimental batch of the Vena self-propelled guns was created in 1995; in 2013, Azerbaijan received 18 vehicles. The 2S31 self-propelled gun is built on the BMP-3 chassis and has a high degree of automation. The self-propelled gun is equipped with a 2A80 gun and is capable of hitting targets at a range of up to 13 kilometers, with a rate of fire of up to 10 rounds per minute. The crew of the self-propelled gun is four people.