Originally Posted by surebet
The upper is restricted on the MP5 family. Rule of thumb is the part of the receiver with the serial number on the real item is the prohibited part.
As for UNCompany, last time I dealt with them I went with EMT, is passes into the hands of Canada Post at the border, simpler if sometimes incompetent carrier.
UNC's website looks like a horse took a dump on a geocities page... but business with them is smooth.