On May 1, 2020, the Government of Canada has prohibited:

nine (9) types of firearms, by make and model, and their variants;
firearms with a bore of 20 mm or greater, and those firearms capable of discharging a projectile with a muzzle energy greater than 10,000 Joules;
the upper receivers of M16, AR-10, AR-15 and M4 pattern firearms.



An idiotic rule intended I assume to ban .50 bmgs and the like also affects most large dangerous game cartridges