I used to lived in Alaska and I had cross that border over 20 times in my lifetime. While I'm not an expert, a prohibited weapon does not necessarily mean a firearm and the mere fact that you are allowed to have a firearm in transit, does not mean that you are allowed in any way shape or form to have that weapon loaded. Transit mean just that going back and forth. Here is a list of weapons that prohibited in Canada and at the bottom there is a link
Good Luck in your travels.
Prohibited Weapons and Devices
If you are a visitor to Canada or a resident of Canada, you cannot import prohibited weapons or devices.
The following weapons are prohibited from entering Canada:
• automatic knives such as switchblades;
• centrifugal knives such as flick knives or butterfly knives;
• gravity knives;
• mace or pepper spray designed for use on humans;
• nunchaku sticks;
• shuriken (throwing stars);
• manrikigusari or kusari (fighting chains);
• finger rings with blades or other sharp objects projecting from the surface;
• Taser and stun guns shorter than 480 mm;
• crossbows designed for one-handed use;
• crossbows 500 mm or shorter;
• Constant Companion (belt-buckle knife);
• push daggers;
• devices shorter than 30 cm concealing a knife blade (e.g. knife-comb);
• spiked wristbands;
• Kiyoga or Steel Cobra batons (spring batons);
• spring-loaded rigid batons (triggered by a button or lever);
• morning stars; and
• brass knuckles.
The following devices are prohibited from entering Canada:
• silencers or devices designed to muffle or stop the sound of a firearm;
• certain cartridge magazines above a given capacity. Generally, cartridge magazines are limited to 5 rounds for centre-fire, semi-automatic rifles or shotguns and 10 rounds for semiautomatic handguns, with exemptions for certain magazines;
• bullpup stocks;
• replica firearms (see additional information on replica firearms below); and
• devices prohibited by regulations.
Replica firearms (prohibited devices)
• are designed or intended to exactly resemble a firearm with near precision;
• are not reproductions of antique firearms; and
• may include airsoft or blank guns.
Replica firearms are classified as prohibited devices. Individuals cannot import them into Canada.