Why:: hand gun with barrel less than 105MM-4.1 inches is a prohibited device, its not restricted but PROHIBITED.
If you want ---google canada fire arms laws-canada politics in canada-wikipedia-contents-item number 4-prohibited hand guns.
If you do this and read it will tell you why.
How if you want to have a hand gun in Alaska and then travel to lower 48, I would suggest.
contact a FFL dealer in Alaska and have your hand gun shipped from your lower 48 FFL to Alaska FFL dealer. But better check Alaska hand gun laws first
I have been in and out of Canada for years hunting and found out they don't screw around with the laws. In fact last time when driving up on a non hunting trip they tore my PU apart looking for fire arms even when I said no, just because I had a NRA sticker on camper window