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Hi Edward and welcome. Yes, the Diamondback Firearms DBX57, which is a 5.7x28mm caliber pistol, is designed to use FN Five-seveN pistol magazines. Diamondback Firearms explicitly states that their DBX57 is compatible with these magazines. Cheers, stay safe and enjoy!

Hi Ed, yes sir, it is compatible with FN 5.7 pistol, as seen on BD web site here >>> https://diamondbackfirearms.com/dbx57-series/ Stay safe & have a great day!

yes the pistol mg will work just fine