Why 5.7?

Why hasn't the FN Five-Seven become more popular or seen much

MSRP $1319 FN Five seveN 5.7X28mm Semiautomatic Pistol

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Why 5.7?

Best 5.7x28mm Pistols [Buyer's Guide]

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Is 5.7x28 better than 9mm?

Why hasn't the FN Five-Seven become more popular or seen much