Magazines designed to contain center-fire cartridges and designed or manufactured for use in a rifle other than a semi-automatic or automatic rifle do not have a regulated capacity. So this will not be pinned.
Not to be "that guy" but if the magazine used in this rifle is the same one that was designed for the Phoenix, then it was in fact designed for a semi automatics center fire....thus subjected to capacity restriction
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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.