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FN 509 Fullsize
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What the compatibility labels mean
How we knowHow we check compatibility
- Lab testedFit checked by Firearm Lab for the recorded setup.
- Documented fitmentSupported by manufacturer, partner, or reviewed community evidence.
- Interface matchMounting details match, but this exact model and part have not been confirmed to fit together.
Check your exact model and part before ordering. Fitment limits
Model details
Manufacturer
FN
Model & version
509 Fullsize · Fullsize
Mounting details
MIL-STD-1913 Picatinny
Compatibility records
110
Lights & rail fitment
Sights
Sights
24 listed- Angry Bear Arms
Pistol Sights for FN 509
Manufacturer documented - Dawson Precision
Sight for FN 509, Fiber Optic Front,
Manufacturer documented - Meprolight
MEPRO CRIS MPO BACK UP IRON SIGHTS
Manufacturer documented - Night Fision
TRITIUM NIGHT SIGHTS FOR FN HERSTAL
Manufacturer documented
Also on this pistol
Holsters
7 makers- ANR Designchecked 2026-07-30
- Blackhawkchecked 2026-11-01
- Concealment Expresschecked 2026-11-01
- DeSantis Gunhidechecked 2026-11-01
- Tier 1 Concealedchecked 2026-11-01
- Vedder Holsterschecked 2026-11-01
- We The People Holsterschecked 2026-11-01
Check each manufacturer’s options for your model, light and optic.
Grip & magwells
Triggers & internals
Barrels & comps
Optics & footprint adapters
Categories with no listings (9)
About the FN 509 Fullsize
Manufacturer listing ↗ · Checked 2026-08-02
- Type
- Pistol
- Manufacturer
- FN
- Model & version
- 509 Fullsize · Fullsize
- Mounting details
- MIL-STD-1913 Picatinny
- Width
- 1.35"
- Height
- 5.56"
- Weight
- 26.9 oz
- Barrel length
- 4"
- Overall length
- 7.4"