Do I need a PAL to purchase firearms?
There are currently 3 exceptions where you do not need a PAL. A flint lock muzzleloading rifle, or an air gun with a rated velocity of less than 500 feet per second, or a firearm that is classified as "antique status".
However, laws can change from time to time. So you should verify that this information is still current by checking with the RCMP at http://www.rcmp-grc.gc.ca/cfp-pcaf/fs-fd/sell-vendre-eng.htm, or you can call them at 1-800-731-4000.