CZ magazine, 9mmP 18 round (Shadow)

Note: Pre-B  magwells are tighter front-to-back than 75B and SP-01 models. Fitment of all available new magazines in Pre-Bs are therefore problematic. Guns vary and magazines vary, so it is difficult to tell whether a magazine will fit in your particular gun or not. Of the current magazines, these (18 round) magazines appear to offer the best chance of success.