Airsoft is a military simulation sport where players participate in mock combat with authentic military-style weapons and tactics. Unlike paintball, airsoft uses 6mm round BBs made of hard plastic. The guns used are full scale replicas of real world weapons.
Paintball is a competitive team shooting sport in which players eliminate opponents from play by hitting them with spherical dye-filled gelatin capsules that break upon impact.
BB guns are a type of air guns designed to shoot metallic ball projectiles called BBs — metal balls approximately the same size as the 0.180 inches (4.6 mm) "BB" lead birdshots. Modern BB guns usually have a barrel with a bore caliber of 4.5 mm (0.177 in) and are available in many varieties.