I remember seeing somewhere that CS9 7-rnd mags would fit well in a short grip pre-rail 3953TSW (7 rnd mag.). I hope so since I just ordered two.

They do work hooksnatcher. I am doing the opposite, using the early 3913TSW mags, with the rounded baseplate, in my early production blue CS9.

I have several hundred rounds through the pistol, using both types of mags, with no issues. Hope this helps. Regards 18DAI

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7 +1 Rounds of hope & change

Thanks 18DAI!!!