The 64 magazines are made from zinc cast and are somewhat soft, but I think your problem lies elsewhere. It sounds like the magazine frame assembly is sitting too high to allow the magazine to come into contac with the bottom of the bolt. No doubt you will need a new magazine, but I would place a shim between the mag frame and the receiver where the screw attaches it on. Make the shim thick enough that the bolt does not touch it, but close enough that it feeds properly.
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