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The problem with the NS522 is the lack of aftermarket or even factory spare magazines. The solution I was thinking of was to build my own mag well and try to convert the gun itself to use something more common like Ruger mags.
If I can make Savage Mark II magazines work in my JW-25A using nothing more than a finishing nail, some plastic from a Sprite bottle and crazy glue, I'm sure the MacGyver's of the CGN community can come up with something.