Here is a bit of info regarding replica firearms from the Canadian firearms act:
Possessing or Acquiring Replica Firearms
Individuals may keep any replicas that they owned on December 1, 1998. A licence is not required to possess a replica firearm, and it does not have to be registered. However, individuals cannot acquire, make or import a replica firearm. If a replica firearm is taken out of Canada, it cannot be brought back in. Businesses may possess, acquire or import replica firearms only if they have a valid Firearms Business Licence that allows them to possess prohibited devices for an approved purpose.
So that clears up the question of replicas, what about a genuine antique handgun and I specifically mean a percussion muzzle loader. One made say in the 1850's or 1860's.
Steve