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Old July 24th, 2009, 01:27   #5
L473ncy's Avatar
Join Date: Oct 2004
Location: 11-30-24-1W5
MP5 upper I believe is what carries the "serial" number and therefore is the part that is prohibited from importation. Whereas with an AR-15 platform the serial is on the lower and therefore lowers are prohibited from importation.

I believe the same goes for the UMP which has a clear upper since that's what carries the serial on it's real steel counterpart.
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