Sig Sauer Magazine P239 .40/.357 Magazine Plus 1 Kit
Sig Sauer factory Magazine Base Plate and matching magazine insert for P239 .40S&W and .357SIG magazines. Adds an additional round making them an 8RD magazine. Only 1/4 inch longer than the 7RD magazines.
These are very nice additions to the normal flush grips, and add a round for very little extra height (around a half an inch). Even if you prefer the flush mag while holstered, having these on your spare pocketed mags is a no-brainer. No issue with feeding or reliability...buy some, at least for your spare mags.