3 (1) Any cartridge magazine
(a) that is capable of containing more than five cartridges of the type for which the magazine was originally designed and that is designed or manufactured for use in
(i) a semi-automatic handgun that is not commonly available in Canada,
(ii) a semi-automatic firearm other than a semi-automatic handgun,
(iii) an automatic firearm whether or not it has been altered to discharge only one projectile with one pressure of the trigger,
(iv) the firearms of the designs commonly known as the Ingram M10 and M11 pistols, and any variants or modified versions of them, including the Cobray M10 and M11 pistols, the RPB M10, M11 and SM11 pistols and the SWD M10, M11, SM10 and SM11 pistols,
(v) the firearm of the design commonly known as the Partisan Avenger Auto Pistol, and any variant or modified version of it, or
(vi) the firearm of the design commonly known as the UZI pistol, and any variant or modified version of it, including the Micro-UZI pistol; or
(b) that is capable of containing more than 10 cartridges of the type for which the magazine was originally designed and that is designed or manufactured for use in a semi-automatic handgun that is commonly available in Canada.
...
(4) A cartridge magazine described in subsection (1) that has been altered or re-manufactured so that it is not capable of containing more than five or ten cartridges, as the case may be, of the type for which it was originally designed is not a prohibited device as prescribed by that subsection if the modification to the magazine cannot be easily removed and the magazine cannot be easily further altered so that it is so capable of containing more than five or ten cartridges, as the case may be.
(5) For the purposes of subsection (4), altering or re-manufacturing a cartridge magazine includes
(a) the indentation of its casing by forging, casting, swaging or impressing;
(b) in the case of a cartridge magazine with a steel or aluminum casing, the insertion and attachment of a plug, sleeve, rod, pin, flange or similar device, made of steel or aluminum, as the case may be, or of a similar material, to the inner surface of its casing by welding, brazing or any other similar method; or
(c) in the case of a cartridge magazine with a casing made of a material other than steel or aluminum, the attachment of a plug, sleeve, rod, pin, flange or similar device, made of steel or of a material similar to that of the magazine casing, to the inner surface of its casing by welding, brazing or any other similar method or by applying a permanent adhesive substance, such as a cement or an epoxy or other glue.