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William, this will fit FNS Compact 9mm/40S&W caliber models only while using full size magazines.

Hi William - this sleeve is for a full size 9mm or 40 S&W caliber mag, when using them in a compact FNS 9mm/40 S&W pistol. It will make a lot of difference in being able to attain a good shooting grip on the small pistol.

9mm and 40S&W, but I would always recommend chatting with Buds as they can be very helpful. Just log in at Buds.com and click the blue chat button on the bottom right of the screen.

9mm and 40S&W