RE: Glock 17C
Those are 9mm mags. Glock doesn't make super high capacity mags for 40 S&W that I'm aware of. Scherer makes an aftermarket high capacity 29 round magazine in 40 S&W for Glocks.......but they have mixed reviews at best. Personally I wouldn't trust my life to a Scherer brand magazine, I'd rather buy extra factory Glock 22 mags and they'll work flawlessly in any size Glock 40 S&W.
Jerry
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