Cloud Defensive
FN 509 Midsize
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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 Midsize · Midsize
Mounting details
MIL-STD-1913 Picatinny
Compatibility records
90
Lights & rail fitment
Sights
Sights
13 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
Triggers & internals
Triggers
5 listed- Apex Tactical Specialties
Action Enhancement Kit for FN 509
Manufacturer documented - Apex Tactical Specialties
Durable Striker for FN 509
Source needs review - Apex Tactical Specialties
Failure Resistant Extractor for FN 509
Source needs review - Apex Tactical Specialties
Slide Maintenance Kit for FN 509
Source needs review
Recoil Springs
1 listedGrip & magwells
Barrels & comps
Also on this pistol
Holsters
2 makers- Blackhawkchecked 2026-11-01
- Tier 1 Concealedchecked 2026-11-01
Check each manufacturer’s options for your model, light and optic.
Optics & footprint adapters
Categories with no listings (9)
About the FN 509 Midsize
Manufacturer listing ↗ · Checked 2026-08-02
- Type
- Pistol
- Manufacturer
- FN
- Model & version
- 509 Midsize · Midsize
- Mounting details
- MIL-STD-1913 Picatinny
- Width
- 1.35"
- Height
- 5.2"
- Weight
- 26.5 oz
- Barrel length
- 4"
- Overall length
- 7.4"