Airsoft guns are sometimes classified as "toy guns," because they are not real and are 1:1 replicas of actual firearms, usually made of plastic or metal that propel plastic pellets known as BBs using compressed air. A BB may be a 5-8 mm round or spherical pellet weighing 110-600 milligrams. Though an airsoft gun may not be real, its design and functional mechanism can be very similar to its actual counterpart.

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