When your starting nerf battle, you should always start with at least 100 nerf darts. If you can't carry all of those nerf darts, use a light wieght bag or backpack.
You also want to have a nerf gun just right for you and a back up pistol, but it has to to be small enough to fit in your pocket.
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The most important thing is to be prepared. Why being prepared is so important is because there is no such thing as time in a nerf fight.