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What makes nerf guns shoot?
Are there other mechanisms besides the spring, compressed air, and motorized flywheels?
Those are the main mechanisms used in Nerf guns, but some specialized models, such as Nerf RIVAL blasters, use a high-velocity spring mechanism that requires a special type of foam ball to be fired. Some other Nerf guns also use different types of foam ammunition, such as arrows or missiles, which may require a different type of mechanism.