The mortar can be a difficult weapon to use, but once mastered it is incredibly powerful. It can switch between smoke grenades(used as markers for follow-up mortar rounds) and the mortars themselves. You can easily wipe out guard checkpoints and camps from afar by simply setting up shop on a hill or rock.
The mortar is acquired at the start of Act 2 in very bad condition, but it can be unlocked by completing the last Gun Store mission.
It is modeled after the Chinese Type 63 mortar.