How to build a cannon or mortar?, well why not make 1 of these flame and smoke breathing mammoths? Look as swallow forge indicates you that it is so easy to make you own mortar. Ever need more punch into your dark powder arms stockpile, well look no more than this 3 inch dark powder mortar gun you can make on yourself. The Swallor forge make a great showing with regars to demonstrating to us generally accepted methods to make a mortar gun from a fire extinguisher. With cutting, machining, and welding. This gun some to fruition, making the fiacre is the sequent step. At the point when it is done, the time has come to make a bee line for the extent.