People who have owned firearms of that class
continuously since their re-classification may be grandfathered for possession of grandfathered
prohibited firearms from the particular
prohibited category. A grandfathered
prohibited firearm must have been in Canada at the time of the re-classification (from
restricted to
prohibited), and the firearm must have been registered as
restricted at the time of the re-classification. AFAIK, unlike with a grandfathered
prohibited handgun,
DFAIT will not issue a permit to temporarily export and then re-import a
prohibited rifle, so - for all intents and purposes - the firearm must have been in Canada continuously ever since the re-classification and the grandfathering. Both the individual and each particular
prohibited firearm must be grandfathered, and both individual and
prohibited firearm may lose it's grandfathered (legal) status. If the grandfathered person ever lets his
firearms license expire, the grandfathered status expires
permanently; that person's grandfathered status, once lost, cannot be regained.
But even those who are grandfathered for (that particular category) and who own a grandfathered HK91 cannot take it out of their home without an
Authorization issued by the provincial
CFO. A firearm in this category cannot be loaded or fired (legally) except at a range approved by
DND as suitable for the discharge of fully-automatic firearms.
For all intents and purposes, due to
Firearms Act regulations, bureaucratic interpretation of these regulations, and modern
DND base and range-access restrictions, even the grandfathered owner is not permitted to fire his grandfathered HK91, not even at a
CFO-approved range. He may, after applying for and obtaining an
Authorization from his
CFO, take it to a gun show, etc.