Originally Posted by Cobalt Caliber
When thinking of ordering weapons over the border in simplest terms look at it this way. A RS M4 rifle uses a 5.56mm round, an Airsoft M4 uses a 6mm round. Now imagine how close in diameter the barrels are. Now imagine a customs agent unfamiliar with airsoft and sees many packages a day and can't stop everything to check that the barrels are about half a millimeter different in size. That is if he/she takes it out of the box, most likely it will be X-rayed and if it looks like a weapon which amazingly it does *poof* gets tossed aside.
P.S. none of what I said may be accurate but when I first started looking at guns and saw ones from USA here was my first thought "This looks pretty damn real, how the hell would this get cross the border."
You aren't allowed to bring airsoft guns in anyway, so even if it was identified as one it would not get through; you might be able to call one an airgun, but I think you need to be there in person.