All firearms ownership is significantly restricted through the licensing requirements, however there are varying degrees of restriction based on the characteristics of the firearms, and the whims of previous governments:
In basic form there are three classification of firearms in Canada:
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Non-restricted: You need a license to own, storage and transport is slightly less strict, can be used for hunting, target shooting on crown land, etc. Broadly speaking these are longarms (rifles and shotguns), over a specific barrel and overall length, not prescribed by regulation as Restricted or Prohibited.
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Restricted: You need to have a restricted license, a permit for transport, can only use at a certified range, much more restrictive for storage, opens you up to on-demand inspections by police. Generally speaking these will be short barrelled rifles, pistols (with barrels over 105mm, not of a proscribed caliber), and rifles prescribed a restricted by name. AR-15’s were so prescribed.
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Prohibited: You need to have owned these before they were classified as prohibited or directly inherited from an immediate relative who did or you cannot possess these. There are several classifications of prohibited firearms and such “Grandfathering” only allows continuous possession of that particular type. If at anytime you lapse in possession of the firearm or a valid license you forever lose the ability to own that type again. Various Prohibited firearms include handguns with barrels less than 105mm, .25 and .32 pistols (except competition models prescribed as Restricted), Rifles that were converted from full-auto, and any firearms prescribed by name to be prohibited. AK-47’s and all variants (except the Valmet Hunter models, used by Inuit Peoples) are so classified, as are several semi-auto .50 Rifles.
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Prohibited Device: These are not necessarily firearms, but several accessories are so designated. These include over-capacity magazines, suppressors, grenades, brass knuckles, barrels shorter than 105mm, specific (typically explosive, incendiary, or armour piercing) ammunition, etc.
Firearms are classified in various ways. A firearm new to the potential Canadian market will be submitted to the RCMP lab for testing and classification. They test to ensure that overall length requirements are met, and to see if the firearm can be relatively easily converted to full-automatic (if so, it will be classified as Prohibited and cannot be imported). If the firearm was initially offered somewhere in full-automatic, it will be classified as prohibited (as a converted from automatic), even if the fire control group was completely redesigned. The Firearms Act also allows for prescription by Order in Council, which is how this new ban was issued.
In Canada, as in the United States, a firearm is legally the serial numbered receiver or frame. This is the controlled (and if restricted or prohibited, the registered) part of the firearm. This is also partly how a firearm that was previously offered in a full-automatic version can be classified as a full-auto conversion even if none of the other necessary parts are available. The receiver is the gun. Most other pieces do not require a license to purchase or possess. You do need a firearms license to purchase ammunition.
So now we get to the new list. There are ~1500 new rifles added to the Prohibited list via Order in Council. The AR-15’s previously classified as Restricted are now designated as Prohibited. The new ban also reclassifies the previously unrestricted upper receiver as a Prohibited Device.
Anything that looks like or functions remotely like an AR-15 (e.g. semi-auto, military cartridge) is now Prohibited even if it was previously a non-restricted rifle. This includes the aforementioned Ruger Mini-14, which doesn’t use the same mechanism as the AR-15, and doesn’t even use the same magazines.
The list includes several previously non-restricted PCC’s (Pistol Caliber Carbines), commonly used for sport shooting and even hunting. (These are typically semi-auto, and black plastic)
The list also reclassifies all .50 target rifles as Prohibited, most of which were non-restricted (and by the way prohibitively expensive to own and shoot, and utterly impractical to do crime with).
The list prohibits anti-aircraft/anti-material firearms including grenade launchers (not that ammo was in any way available for these).
The list also prohibits any M1A type rifles and variants (semi-auto, military cartridge, black plastic or wooden furniture), which also were previously unrestricted. I’ve seen plenty of “hunting rifles” scarier looking than these.
There is a 2 year amnesty period to ensure firearms owners have the time to properly dispose of their now prohibited firearms. The Order in Council mentions the further intent of the Government to introduce legislation to compensate gun owners for fair market value of their now illegal property when surrendered sometime in the future. It also make nebulous mention of the possibility of “Grandfathering” in ownership of these prohibited firearms to some gun owners.
I found it interesting that because of the large number of non-restricted (and never registered) firearms on the new list, there is no good estimate of how many of these firearms are currently in the hands of Canadians. The Order in Council document specifically notes this as well as noting that the majority of restricted (therefore registered) firearms now prohibited are located in British Columbia, Alberta, and Ontario.