Operated by the Soviets during WWII, the MT-13 Heavy Mortar launched 160mm shell out of its 9 foot long barrel. The actual size of the barrel was actually a problem on its own because as it turns out, loading a 90lb projectile in a 9ft long barrel is very hard. Because of this, they had to redesign the entire weapon, because on top of the problem of loading a 90lb projectile in a 9ft long barrel, the recoil from firing a 160mm projectile literally shoved the baseplate in the ground. Even when the problems were resolved, this weapon required lots of elbow grease as four, specially trained men operated the weapon.
Number Produced: 550