Grenades

[Tibbs735]

End-caps are supposedly quite hard to get hold of, you can use car body filler to seal the ends of caps by pressing the pipe into a plastic dish of the stuff.

Simple electric detonators can be made by gently filing off the end of a small light bulb, Christmas lights work quite well. Then fill the bulb with flashpowder, gunpowder, whatever-powder you can find. Seal the end with wax. When electricity runs through this, it will burn out the bulb and ignite the powder, as well as whatever you have surrounded it with.

Possible Uses:
Your BOL is about to be overrun by the proletariat masses. You hide a surprise linked to an alarm clock, except the alarm is re-wired to said bulb for 20 minutes time. It will go off whilst they are inside your captured BOL.
Breaking open things from a safe distance, instead of lighting it and running away.
Igniting your moat filled with flammable whale oil when the tripwire is broken.