.40 Mags in a .357A1 ?

[MrBruceWayne]

The norm and rule of thumb is with any given manufacturer, you can easily swap .40 mags with .357 mags & visa-versa, with no malfunction or alteration or with feed performance. I had just purchased an M357A1-it came with 2-12 round mags-but before I start making purchases of 3 or 4 mags over the internet, I wanted to hear from the forum. Again, I'm already aware of the .40/.357 Sig case diameter being identical, however I want to be certain and avoid a $100.00 error because the gun may-or-may-not be "picky" with its mag.

SigPro has the mags stamped with .40/.357 for use. My XD-40 mags worked flawlessly in my friends XD-357 with no alterations. The M357A1 only has .357Sig on it.

Any info regarding this would be of great help.

[Aerobolt]

.40 s&w mag can be used in a .357 sig chambered Steyr without any alteration and reversed .357 into a .40 of course. This goes for the barrels, .40 to .357 or .357 to .40, as well in the Steyr without any other modifications. Enjoy your new .357 Steyr - I have many .357 chambered firearms and while I agree with your previous post that the round is a little pricey I must say they are a lot of fun to shoot!