[Hat in the Cat]

Not to derail but I read this and really don't knowhat I'm missing...

Airsoft guns are devices that have a low muzzle velocity and muzzle energy, and usually discharge projectiles made out of a substance such as plastic or wax rather than metal. An airsoft gun, firing a .20g*6mm*plastic pellet, with a muzzle velocity below 111.6*m/s (366*fps), and resembling with near precision an existing make and model of a firearm, other than an antique firearm, is a replica firearm and therefore a prohibited device.

What is the clause that makes these legal as I've seen some pretty realistic looking ones.