Will Sig P320 .40 cal mags work in the 9mm gun?

It will work in the case of the P226 mags. I have not tried the same scenario in the P320 mags.

It won't work well in all cases. For instance I did not have good luck with Glock 17 mags.

I've heard double stack Glock mags will run fine, but single stacks will not. I personally don't bother. Ammo is expensive enough without finding creative new ways to go through it faster.
 
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