BB guns are a type of air gun designed to shoot projectiles called BB after the Birdshot pellet of approximately the same size. These projectiles are usually spherical but can also be pointed; those are usually used for bird hunting. Modern day BB guns usually have a smoothbore barrel, with a bore diameter and caliber of 0.177 inches (4.5 mm). BB for modern day BB guns are usually steel, plated either with zinc or copper to resist corrosion, and measure 0.171 to 0.173 inches (4.34 mm to 4.39 mm) in diameter. Some manufacturers also still make lead balls of slightly larger diameter and which are generally intended for use in rifled BB gun barrels, as were formerly used in BB guns. Some Asian companies make plastic BBs for recreation.
One of the most famous BB guns is the Red Ryder BB Gun by Daisy Outdoor Products, modeled after the western Winchester rifle. First introduced in 1938, the BB gun became an iconic American toy, and is still in production today.
Airsoft guns are also commonly referred to as BB guns or pellet guns, as they also launch spherical projectiles (typically through a smoothbore barrel). Common airsoft "BBs" are 6 mm in diameter (0.24 inches), and are generally made of plastic or other non-metallic materials specifically designed to impart low target damage (however, such can still be dangerous if carelessly or improperly used). Airsoft projectiles are often employed for wargames similarly to paintball.
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