Marstar Guarantee
I would class the magazine as "part of the Norinco Firearm" as noted below. I received a replacement magazine for my Nork Tokarev 6+ months after I bought it. But I do take your point about the logic of returning $10 magazines for replacement.
Norinco Firearms One Year 'in Canada' Parts and Labour Warranty
This statement of warranty applies to new North China Industries (Norinco) firearms purchased directly from Marstar Canada Inc. and registered to the original purchaser. In addition to Marstar's Ironclad Guarantee, we offer the following limited non-transferable warranty to the original owner of new Norinco firearms purchased directly from Marstar Canada, inc.:
One (1) year parts and labour for repair or replacement of the Norinco firearm or its parts (by our armourers and at our discretion) which have proven defective in materials and/or workmanship. Under no circumstances is this warranty to be construed as conferring any liability for loss, damage, or injury sustained, directly or indirectly, through the use by any person of any Norinco firearm.