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Neptune Concealment Kydex Holster for FN 5.7 - Light / Laser Bearing Nestor Series IWB or OWB - Veteran Made in USA [link]. Got it from here.
not trying to be a dick, but first 3 results for "fn five seven kydex owb holster"
Looks like you even have some light bearing options. All you need would be a good belt. I recommend the wethepeople holsters, I have one and it's just fine, cheap too.