Outside of Walmart, Canadian Tire and other sporting good shops, there are very few places in Canada where a non-Age Verified person can obtain airsoft guns, especially the good quality, black, metal ones. Most of the retailers in Canada have taken the ASC Age Verification system as a security measure for they're own use.
Now, having said that, the Kraken/Aftermath AK's and the Broxa MP5 can be a decent gun if properly serviced by a good gun doctor and given a decent paint job. These can usually be pruchased through the above shops.
ASC Age Verifier for Red Deer & Area Alberta