Taken from Wikipedia Under United States law, the receiver is the actual firearm itself,[2] and as such it is the controlled part (without which operation is impossible). Generally, the law views the receiver as that part of a firearm housing that has the serial number upon it. Thus, in the case of a firearm that has multiple receivers (such as the AR-15, which has an upper and lower receiver), the legally controlled part is the one that is serialized (the lower, in the AR-15's case).
Basically if the part on the real steel gun is supposed to have the serial # on it, that part is most likely restricted for importation
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