Easy to make K'nex Grenade. I don't know if this idea has been used yet, and please don't complain if they have. I am not trying to copy anybody. This is my first instructable, so please don't complain about bad quality.

Step 1: Materials

Materials:

You will need 2 grey one-slot connectors, one grey rod, and either 57 blue spacers OR 19 grey spacers.

Step 2: Putting It Together.

Pictures:
                                           One: Get this
                                           Two: Add one grey one-slot connector to the end
                                           Three: Add the blue spacers�ver spacers
                                            Four: Add the other grey one-slot spacer to the other end of the rod

Step 3: Using the Grenade:

How to use:

Take off one of the grey one-slot connectors.
Hold the grenade by the other grey one-slot connector.
Flick your wrist, or make a throwing motion toward the ground, but do not let go of the grey connector.
If you do it correctly, the blue (or grey) spacers will hit the ground and scatter around.

Variations:
You can use different sized rods with the corresponding spacers, or just use less spacers.

Have Fun!!