I know this isn't original, so just give me credit for extra darts
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Step 1: Step: 1 Materials
21 Nerf darts (Streamline)
1 small rubber band (The smaller the better)
Step 2: Step 2: Making the Grenade
just take all of the darts, bundle them together, and wrap the rubber band around it
Step 3: Step 3: Arming It
To arm it, move the rubber band up the grenade until the bottom flares out
Step 4: Step 4: Throwing It
Under hand it tips first. The blast radius really depends on how fast you throw it.I just dropped it about a foot
If anything is wrong with it or you fix any problems, let me know. Thanks!