Home Gun Review: FN 509 Striker-Fired 9mm Semi-Automatic Pistol – Updated 2018 FN 509 rear sight (left) and FNS Compact rear sight (right) (courtesy thetruthaboutguns.com)

FN 509 rear sight (left) and FNS Compact rear sight (right) (courtesy thetruthaboutguns.com)

FN 509 magwell (courtesy thetruthaboutguns.com)
FN 509 (courtesy thetruthaboutguns.com)
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