Just an FYI... Firearms in Canada, Trading Firearms.
Non-Restricted Firearms (Any Pump or Semi-Automatic Shotgun with a barrel-length greater than 18.5 inches) must be plugged to 3 shells while hunting. If trap or target shooting you may be fully loaded with no chamber plug. Rifles follow a similar rule while hunting and may not have any more than 5 rounds loaded and all magazines must be pinned to 5.
Restricted Firearms (All Handguns, Assault Rifles and a number of other firearms) - Can only be transported from your home to an authorized shooting range (that you must be a member of). If you do not have a membership at a shooting facility your firearm cannot leave your place of residence unless paperwork is filed and an Authorization to Transport has been granted.
This all being said and to keep on topic I have never seen any reptile trades for firearms. Since the long-gun registry has now been removed Non-Restricted Firearm trades are easy and could be considered if proper licensing is provided. Resticted firearm trades would still need to go through the government and all proper paperwork would need to be completed as mentioned above, quite the lengthy process.