Apex is a US DOS DDTC-registered manufacturer, but is not a registered exporter, so they cannot export gun parts.
Brownells, a US DOS DDTC-registered exporter, can and will ship to Canada, and they will ship to you by whatever method you specify.
The best shipping method - by far - is the U.S. Postal Service.
P.S.: Do not forget that the use of Apex parts will exclude the pistol from IPSC Production Division.