5.7 x 28mm

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FN Five-Seven MRD 5.7x28mm Pistol with 4.8-Inch Barrel, Black Finish - Part 66101274

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FN Five-Seven MRD 5.7x28mm Pistol with 4.8-inch Barrel and Optic Ready Slide

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FN Five-Seven MRD 5.7x28mm Semi-Auto Pistol with Flat Dark Earth Finish - Part #66101275

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FN Five-Seven MRD Pistol with Flat Dark Earth Finish and 4.8-Inch Barrel - Part Number 66101277

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FN Five-Seven Pistol with 4.8-inch Barrel in Black - 5.7x28mm, 10+1 Capacity

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FN Five-Seven Pistol 3868929352 in Flat Dark Earth with 4.8-inch Barrel and 10+1 Capacity