Don't forget the BX-25 mags are restricted to 10 rounds and they must be pinned.
Special Bulletin for Businesses No. 72
Background
The maximum capacity of a cartridge magazine is set out in Part 4 of the Regulations Prescribing Certain Firearms and other Weapons, Components and Parts of Weapons, Accessories, Cartridge Magazines, Ammunition and Projectiles as Prohibited or Restricted. The Regulations prescribe “prohibited devices”, and a magazine that has a capacity which exceeds the maximum permitted capacity is a prohibited device. Businesses can be in possession of prohibited devices if appropriately licensed. However, individuals may not possess prohibited devices.
The magazine regulations have been in force since 1993. However, in recent years, new cartridge magazines have been introduced which have resulted in novel situations as it concerns the application of the Regulations. There has been no change to the Regulations. Nonetheless, the application of the existing Regulations to a few new products has given the appearance of a change in the law. This has been particularly evident in the case of cartridge magazines designed or manufactured for more than one type of firearm.
Purpose
The purpose of this bulletin is to provide greater clarity on the maximum permitted capacity of cartridge magazines designed or manufactured for use in more than one kind of firearm. Note that the maximum permitted capacity of a magazine is determined by the physical characteristics of the firearm it is designed or manufactured for and the type of ammunition for which it is designed. The maximum permitted capacity of the magazine does not depend on the classification of the firearm, nor does the magazine capacity influence the classification of the firearm.
Current Issues
1. Magazines designed or manufactured for both rimfire calibre rifles and handguns
Magazines designed to contain rimfire cartridges and designed or manufactured for use in a rifle do not have a regulated capacity. However, magazines designed to contain rimfire cartridges and designed or manufactured for use in a semiautomatic handgun are limited to 10 cartridges. Magazines designed or manufactured for use in both rifles and semiautomatic handguns are subject to the handgun limit of 10 cartridges.
Example:
Smith & Wesson M&P 15-22 rifle and 15-22P pistol chambered for 22LR caliber:
the 10 round magazine is unregulated
the 25 round magazine is a prohibited device
Example 2*: The Ruger BX-25 magazine, chambered for 22 LR calibre, is designed and manufactured for use in the Ruger SR22 rifle, the 10/22 family of rifles/carbines and the 22 Charger handgun. As a result, this magazine is a prohibited device unless modified so its capacity is 10 cartridges or less. (*This information was not included in the original version of this bulletin, but was added on 2013-09-05.)
Found the regulation!! Crap man, I had no idea, this kinda sucks. Is this for all aftermarket magazines now for .22 LR or just the BX-25 magazine?