Originally Posted by who101
would a metal M4 body or a metal gas pistol barral be allowed over the border
No, an M4 metal body would not be allowed over the border. In short an upper technically should pass but definitely not a lower. The part of a receiver where the serial number would be located is the restricted portion. On armalite models it would be lower, on an MP5 it would be the upper.
As for a "metal gas pistol barral" you should have no issues importing a barre
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