This is my first instructable, so hang tight. This grenade is obscenely dangerous, and should only be attempted by professionals or people with little-to-no attachment to their various extremities. Okay, maybe I'm exaggerating a bit, but this thing could easily take off a few fingers if you handle it improperly. Also, the noise is near-deafening, so watch out!
Step 1: What you'll need:
1 Key-Chain Ring
1 Pack Strike-On-Box Matches
1 Commercial-Grade Firework
50-200 Cheap Airsoft BBs
1 Toilet-Paper Tube
Step 2: Remove Striker Pads
Use the scissors to cut apart the match box and save the pads and top and bottom for later.
Step 3: Take Apart Firework
Use the scissors to carefully disassemble the firework, removing the warhead from the rocket. Cut the main fuse off the rocket, and then discard.
Step 4: Seal the tube
Seal one end of the tube with duck tape.
Stuff a couple tissues or sheets of toilet paper down the tube.
Add about half of the BBs to the tube.
Bind all three fuses together with scotch tape.
Assemble the triggering mechanism by taping the two strikers facing each other over the clip, and looping the ring through the end.
Tape six matches around the fuses.
Put the whole explosive together. Note: This mechanism can also be employed to great effect with smoke bombs. Just substitute caramelized sugar and KNO3 for a firework and BBs.
Wrap the explosive loosely in tissue, and pack it in the tube on top of the BBs.
Fill it up almost to the top with BBs, then pack another tissue in on top for good measure.
Tape off the top, then decorate as you wish! Have fun fragging your friends and try not to blow off your hands! The blast radius is about 15-30m, and within 5, they will draw blood. Be careful!