Fill out outer jacket with BBs, inner jacket with gunpowder, or other explosive. Glue endcap on and put solid safety plug in. To make an electric ignition wire 6 AA batteries in series add a switch to the positive side and leave lots of wire at the end of the positive and negative wires solder 10mm of nichrome wire. Now you can insert the nichrome soldered end through the hollowed endcap. Bury mine under 1in to 1/2in under dirt horizontally along a narrow path. Stand back over 100 yards and complete the electric circuit by flipping the switch, heating the nichrome over 1000 degrees Fahrenheit, and igniting the gunpowder or other explosive.