Could you make a ghetto mortar out of an iron pipe? Answered
Imagine that you take a four foot long iron pipe and cap one end of it. Near the capped end, you make reasonably sized exhaust holes. Just above said exhaust holes, there would be a few metallic protrusions that would stop a round from sinking to the bottom of the barrel. Aforementioned round shells would be made of smaller, thinner metal and filled with propellants. Means of ignition is still TBA. But if such barrel and rounds were constructed, could it effectively launch rounds long distances?