Low muzzle velocity/energy guns
Any barrelled weapon that is not designed or adapted to discharge projectiles at a muzzle velocity exceeding 152.4 metres per second (500 feet per second) and at a muzzle energy exceeding 5.7 Joules, or to discharge projectiles that are designed or adapted to attain a velocity exceeding 152.4 metres per second (500 feet per second) and an energy exceeding 5.7 Joules. Both thresholds of 152.4 mps and 5.7 Joules must be exceeded for the firearm to be considered “controlled”. This requirement exempts firearms that fire below the threshold velocity with a standard projectile, but exceed the threshold velocity when fired with a high-velocity projectile
This mean to have 5.7 joules the airsoft with 0.20 g bb would have to shoot over 700 fps to be considered and firearm...