F25 Anti-Personnel Grenade
This is the new grenade i talked about in my new magazine forum topic: Here
It uses a spring motor that is activate by pushing up the pin on the bottom (after being cranked) to fling shrapnel to distances not achievable by your average run-of-the-mill grenades...or should I say blunt throwing objects...*cough cough*. On average, this grenade can fling various shrapnel (green rods, ball joints and connectors, etc...) up to 25 feet. The best feature of the grenade, besides its blast radius, is how YOU DON'T NEED TO REASSEMBLE IT; you just reload the shrapnel, and toss again.
I also have a slightly different version of this that can be fired from a Knex RPG!!!!! (coming later this year, because the M4 is using most of my pieces).
If you want i will post an instructable for it but you can probably build from pictures.