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yes they are Glow in the dark sights ( Luminescent 3 Dot Combat Sights) see *******Specifications and Features:
FNH USA FN-509 66-100002
Semi Automatic Handgun
Striker Fire Double Action Autoloader
9mm Luger
4" Cold hammer forged steel barrel with recessed target crown
Polished chamber and feed ramp
5.5 to 7.5 LB trigger pull
17 Round Capacity
Slide features stainless steel construction
External extractor with loaded chamber indicator
Front and rear cocking serrations
Two interchangeable back straps
MIL-STD 1913 accessory mounting rail
Fully Ambidextrous slide stop lever
Fully Ambidextrous magazine release
************* Luminescent 3 Dot Combat Sights
Polymer frame
Matte Black finish
Overall Length 7.4"
Overall weight unloaded 26.9 oz

Yes! these are the type where you can "charge" them with a quick shot from a flashlight or other light source and they glow for hours.

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Hi Christopher, Yes they are Glow sights. Specs - ( Luminescent 3 Dot Combat Sights) FNH USA FN-509 66-100002 Semi Automatic Handgun Striker Fire Double Action Autoloader 9mm Luger 4" Cold hammer forged steel barrel with recessed target crown Polished chamber and feed ramp 5.5 to 7.5 LB trigger pull 17 Round Capacity Slide features stainless steel construction External extractor with loaded chamber indicator Front and rear cocking serrations Two interchangeable back straps MIL-STD 1913 accessory mounting rail Fully Ambidextrous slide stop lever Fully Ambidextrous magazine release Luminescent 3 Dot Combat Sights Polymer frame Matte Black finish Overall Length 7.4" Overall weight unloaded 26.9 oz

Yes they do. They are not true night sights but the higher the retained "Charge" from a light source the brighter they glow. A very good illustration is here with pictures : defensivecarry.com/forum/defensive-carry-guns/132997-luminescent-sights-best-kept-secret.html