http://www.rcmp-grc.gc.ca/cfp-pcaf/fs-fd/prohibited-prohibe-eng.htm said:
Can I acquire a prohibited firearm if I am not grandfathered?
No you cannot:
Exception: If you are not grandfathered, the only prohibited firearms you may possess or acquire are handguns with a barrel length of 105 mm or less or that discharge .25 or .32 calibre ammunition, and only if all of the following criteria are met:
* the handgun was made before 1946, and
* the handgun was registered in Canada on December 1, 1998, and
* you are the child, grandchild, brother, sister or spouse of the lawful owner, and
* you are acquiring it for an approved purpose such as target shooting or as part of a collection.
In these circumstances, you can lawfully possess the handgun in question, but you are not grandfathered or authorized to acquire more prohibited handguns.