Hmm, I can make Savage Mark II mags fit and work in my JW-25A using nothing but crazy glue, some plastic from a pop bottle lid and a piece of a small finishing nail. (Because nobody has the Norinco mags and metal CZ 452 mags are 2X the price of the Savage ones.)
There has to be ~something~ out there more commonly available that fits or can be made to work. The last resort would be to somehow change the mag well itself to accept something more common....