Basically, M203 was not considered a firearm in the past, therefore airsoft versions could not be considered prohibited replicas. Now, you must register real M203s as restricted firearms, therefore airsoft M203s will be classified as prohibited replicas. It may take some time for all agencies to get on-board, or it may not.
At any rate, I would tread lightly on out of country ordering of M203s, shells and especially sighting devices (leaf, quadrant, etc) as they are classified as controlled goods already.
Age verifier Northern Alberta
Democracy is two wolves and a sheep discussing what's for dinner.
Freedom is the wolves limping away while the sheep reloads.
Never confuse freedom with democracy.