Prohibited 10/22 Platform Magazines / Chargeurs prohibés de plateforme 10/22

I have received a number of inquiries regarding 10/22 magazines. Today I received an update from the Canadian Firearms Program that clarifies the situation.

Prohibited 10/22 Platform Magazines / Chargeurs prohibés de plateforme 10/22

***La version française suit***
Issue
This concerns the classification of 22 Long Rifle (22LR) calibre cartridge magazines designed or manufactured for Ruger 10/22 rifles, Charger pistols and related firearms, commonly referred to as the “10/22 platform”.
History
The Canadian Firearms Program (CFP) has responded to numerous queries from individuals and firearms businesses concerning the classification of magazines designed or manufactured for Ruger brand 10/22 rifles and Charger pistols, plus clones of such firearms made by other manufacturers. The overall issue was that any 10/22 platform magazine which exceeded ten shots capacity was a prohibited device. This information was also well circulated on Canadian online forums specializing in firearms issues. The CFP specifically addressed one of the more common overcapacity 10/22 platform magazines, the Ruger BX-25 magazine, which contains 25 cartridges and is described by Ruger as being manufactured for both the Ruger 10/22 rifle series and 22 Charger pistol series, identifying the BX-25 magazine as a prohibited device (CFP Bulletin 72, 2013-09-05).
Additionally, the Canadian International Trade Tribunal (CITT) decided that a similar magazine, the Ruger BX-25x2 magazine (50 shots), was a prohibited device (AP-2013-059).
Magazines up to 110 shot capacity are available. Although the 22LR cartridge is less powerful than most, it is nonetheless lethal, and combined with high capacity magazines, presents a public safety hazard and an officer safety concern when responding to incidents involving these magazines.
Notwithstanding the steps taken to inform the Canadian public and firearms businesses, it appears that prohibited 10/22 platform magazines continue to be imported into Canada and sold by unqualified businesses and individuals.
Rationale
In short, 10/22 platform magazines are designed and/or manufactured for both rifles and handguns. While rimfire calibre rifle magazines are not regulated, the capacity of handgun magazines is universally limited to ten cartridges, and in consequence, 10/22 platform magazines are prohibited devices if the ten shot limit is exceeded. Whether the magazine is intended by the importer to be used in a rifle is not relevant to the classification determination.

Summary
All 22 Long Rifle calibre magazines for the 10/22 platform, regardless of brand, are prohibited devices at any capacity exceeding ten shots. The ten shot limit applies irrespective of the type of firearm it is used in. Magazines exceeding ten shots capacity are not prohibited devices if reduced in capacity to ten shots or less by pinning or by other means described in the magazine regulations.
Action Required
CFP will continue to distribute the information to law enforcement (CACP, CROPS, NWEST, Public Safety Canada), businesses and clients (through CFO's offices) concerning the classification of those magazines.