The part of the gun that has the serial Number on it ( in a real gun ) needs to be made of clear material
So for most Rifles that is the lower receiver.
For common SMGs like the mp5 that is the upper receiver
for pistols it is the frame that must be clear
as a rule ... the largest part of the body must be clear to have the guns fall well within being classified as a "imitation" firearm ( ok to import by anyone) and not a "Replica Firearm" ( only importable with a special import license and not legal to retail to non BFL holders )
CAPS Range Officer
Toronto Downtown Age Verifier
If the tongue could cut as the sword does, the dead would be infinite