In the case of magazines built by Black Dog and many others, their AR-22 magazines (for example) were "designed and manufactured" to be used in the AR rifle conversion kits. Since they were designed for rifles they are classified as rifle magazines. It has nothing to do with what they might also fit or might later be used in... the law in this country does NOT regulate the firearm in which the magazine is subsequently used in and RCMP have repeatedly stated that fact.
Same for the 10/22 rifle magazines. They were all designed and manufactured for the 10/22 rifle... the appearance later of a 10/22 pistol would not affect the capacity of 10/22 rifle magazines unless someone designed and manufactured a magazine to be sold with BOTH guns....
Black Dog's rimfire magazines have always been designed and manufactured for rifles (not pistols). They are classified as rim-fire rifle magazines with an unlimited capacity allowance.
Mark
Excellent news if that's how these latest rulings play out.
Permit me to beat on my familiar drum again, however. Since the Chiappa mags were purchased legally and in good faith, fairness should compel the government to reimburse owners or pay for the cost of pinning them in accordance with the retroactive classification. Same as the 1522 mags.
Every owner of either gun/upper should write to Vic Toews (or his successor) demanding compensation.