I've posted this elsewhere when this question was asked. Here it is again for those who missed it.
From the CCFR Website:
Now - many of you have written in asking about handgun parts. So here's the breakdown from Public Safety:
Moreover, the restrictions will apply to all restricted handguns, except for those classified as “antique firearms”, including the import of the frame or receiver of the affected handgun(s), as they are captured within the definition of “firearm” in section 2 of the Criminal Code. The restrictions do not apply to other parts and components, as they are not regulated, and on their own, do not fall within the definition of a “firearm.” However, any firearm part or component that is considered a prohibited device under the Criminal Code or is a part or component for a prohibited firearm will still require an import permit under the Export and Import Permits Act.
So basically, regulated parts that are defined as the "firearm" are banned from import, parts like grips, triggers, etc are not affected.