Nope you cannot import.
Importing a replica Firearm (airsoft) is illegal, it will get seized and destroyed, and you'll get a nasty letter and a bunch of headache.
Yes, there are some available in Canada.
A few for sale on this site right now actually.
To veiw the guns in Canada you got to be "Age Verified" (under my pic you can see a white bar that says "AGE VERIFIED"
To do this, find your local rep.
Send him a PM, asking to meet up and get Age verified.
And he'll take ya from there.
Reading the FAQ will answer a bunch of your questions to.