2S31 Vena Self-Propelled Gun
| Entered service in | cancelled 2016 |
| >Crew | 4 |
| Dimensions and weight | |
| >Total weight in combat order | ~ 19.5 t |
| >Chassis length | 6750 mm |
| >Overall length | 7400 mm |
| >Overall width | 3150 mm |
| Armament | |
| >Main gun | 2A80 120-mm rifled gun |
| Machine gun | 7.62-mm |
| >Traverse range | 360 degrees |
| >Elevation range | - 4 to + 80 degrees |
| Maximum rate of fire | 8 - 10 min |
| Combat load | |
| Main gun | 70 |
| Machine gun | 500 |
| Projectile weight | 17.3 kg |
| Projectile initial speed | 560 m/s |
| Maximum range of fire | 7.2- 13.0 km |
| Manimum range of fire | 0.04 km |
| Mobility | |
| >Engine | UTD-29 |
| >Engine power | 450- 500 hp. |
| >Maximum road speed | 70 km/h |
| Amphibious, maximum speed on water | 10 km/h |
| >Autonomy on roads | 600 km |
| Maneuverability | |
| >Slope | 60° |
| >Vertical step | 0.8 m |
| >Ditch | 2.5 m |
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