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Obviously a Nerf gun is pretty critical, but dark clothing and knee pads/elbow pads and some leather gloves work great to get you into the spirit of things. What about binoculars and sunglasses? Why not? Popular varieties of Nerf guns include:  The Rapidstrike The Centurion The Elite Stryfe The Vortex Diatron It helps to be able to run around a little bit, so you should be in shape and ready to move. If you can outrun your assassins, you'll be in good shape to come out on top. Even the super-expensive varieties aren't necessarily the most accurate toys out there. If you jump into the game without practicing, you're going to wait for the perfect opportunity to eliminate someone and misfire and end up out of the game and feeling dumb. Practice shooting at cans and other targets to get a sense of how your Nerf gun behaves.
Get the gear. Learn to move with your gear. Practice a bit with your Nerf gun.