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Old June 4th, 2010, 08:56   #26
m102404's Avatar
Join Date: Apr 2006
Location: Toronto
"lower" is not always the case. More accurate to describe the limitation as "receiver".

The receiver of different items will vary from model type to model type. Basically...whatever part on the real firearm version contains the "action" (firearm it) is considered "the firearm" and thus controlled for import.

Everything else is just an "accessory" of the firearm. The barrel, grips, sights, RIS/RAS, dustcovers, selectors, etc....

For example...
M4 - Lower Receiver
SCAR - Upper Receiver
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