Detonators (blasting caps) can be made from a used small arms cartridge case and field-manufactured explosives. Detonators are used to initiate secondary high explosives (C-4, TNT, etc.).
This destructable was "borrowed" from The Army's Improvised Munitions Handbook, courtesy of Steal This Wiki.
As the views break 2050, I would like to thank you all for reading, it makes me feel useful. =P
Be sure to read the warnings.
Legal Disclaimer: THIS INSTRUCTABLE IS FOR ENTERTAINMENT PURPOSES ONLY, DO NOT USE THIS ARTICLE TO BLOW THINGS UP, AND BY READING THIS INSTRUCTABLE YOU AGREE THAT I AM NOT LIABLE FOR ANYTHING YOU DO WITH THESE BLASTING CAP(S).
Step 1: Materials Needed and Primer Removal
Remove fired primer from a used cart ridge case using a sharpened nail.