I use to be 18, I know how much of a let down it is when you wanna try to do something but can't due to age restrictions like going to a bar or a strip club...ahem...moving on.
Only thing I can probably suggest that I hope won't land me in the furnace is to contact the place where you got your gun from. I've never seen clear receivers being sold on here being a bit of an elitist community that demands non-clear metal, who can blame them really. Only thing that could stand in your way is if your parents bought it for you because the seller age checks. Then again, I don't know QC laws on airsoft.
"Hey I'm the first one to say its a great country but its a straaaaange culture. This is a place where gun store owners are given a list of stolen credit cards but not a list of CRIMINALS and MANIACS. And now they're thinking of banning toy guns...AND THEY'RE GONNA KEEP THE F**KING REAL ONES!"
-George Carlin 1937 - 2008 (RIP buddy)