The SPG-9 is a small calbre (relatively!) Soviet made recoiless rifle.
It is still widely used across the globe by standing armies and rebel groups as an effective anti-infantry and anti-armour weapon. It is also commonly mounted on skiffs and larger vessels by pirates as well as in Technicals.
The SPG-9 is supplied with a low tripod and can be used individually or mounted in the back of a technical with the tailgate down. It can be converted to be mounted on a post or other device to raise it above the truck bed, allowing it to fire out of the side.