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Ryan, It is best to get a 9 mm magazine. This magazine will feed 9 mm rounds. But I don't know about the fit in a 9 mm handgun mag well or how dependable it would be. Just best to get a 9 mm magazine for a 9 mm handgun.

If the company doesn't recommend it then just go with that. I mean, if you're just going to experiment or hit the range then I guess. But expect to have issues. If it feeds it might not be reliable. If you plan to conceal carry then that's a big mistake. I agree with Michael. Just get 9mm magazines for the 9mm pistol. It was my pleasure to assist you. RIP Kobe Bryant.

Ryan, it will somewhat but not reliably due to the 357Sig being a 40S&W Case necked down to a 9mm bullet. The 40S&W case is a larger diameter than a 9mm case. I know of some folks that have measured and bent the feed lips to match a 9mm magazine but, you have to get it right cause your life may depend on it so I recommend just getting 9mm specific magazines.