Toy gun ammo can come in a variety of forms, including pellets, caps, and BBs. Pellets are typically made of lead or plastic and are 6 letters long. Caps are small cylindrical pieces of paper or plastic that contain a tiny amount of explosive material and are 4 letters long. CAP is also 3 letters long and is a type of ammunition used in toy guns. BBs are small metal balls that are 3 letters long and are often used in airsoft guns.