[Zfurlong]

your est bet would likely be to contact a retailer (a reputable one), and have the place a special order for you as they would most likely have the appropriate licenses in order to get the parts, if not, find a gunsmith local to you and talk with them, explain what the part is, what it is meant for, and what you plan to do with it, ensure that you have resources on hand that you can show pertaining to airsoft as well as those pertaining to firearms, and ask them about having them bring it in for you. this will be your best possible chance at getting the part imported.