WGC order? I'm gathering that it isn't a retailer...so by rights...whom ever is doing the order should not submit the AEG into the order. THEY know it will be taken....so you should be in the clear. If they do submit the order with the AEG they shouldn't be doing orders in the first place.
However, if for some odd reason the gun does get ordered...your pretty much screwed. Customs checks out anything airsoft related. There seems to be someone in Customs who is kissing some ass and putting a hurt on for airsoft to make themselves look better. ( IMHO ).