The Holosun 509PLT-FN509T is a genuine Holosun adapter plate that mounts a 509T-footprint enclosed red dot sight — the HS509T X2, HE509T X2 or HE509T-X2-GD — onto the FN 509 Tactical low-profile optics-mounting system. The plate and the correct screws for both plate-to-slide and optic-to-plate are supplied together.
The 509T uses Holosun's own rear-lug footprint rather than the RMR or RMSc pattern, so it will not bolt straight onto a factory optic cut. This plate is the part that bridges the two.
How It Compares
For an FNX-45 Tactical use the 509PLT-FNX45 plate, for a Glock MOS use the 509PLT-MOS9MM plate, and for an RMR-cut slide use the 509PLT-507C plate. Browse all red dot mounting plates and enclosed red dot sights.
Ideal For
- Airsoft gas blowback pistol builds that use a FN 509 Tactical slide
- Section 1 long-barrelled pistols and revolvers built on a FN 509 Tactical pattern
- Licensed pistol setups in Northern Ireland and target work overseas
- Training and dry-practice rigs where the optic needs to move between hosts
Key Features
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Optic Footprint: Holosun 509T rear-lug footprint, not RMR and not RMSc
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Host: FN 509 Tactical optics-mounting system
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Hardware: plate-to-slide and optic-to-plate screws supplied
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Build: genuine Holosun part, machined to Holosun's own tolerances
Technical Specifications
| Optic Footprint |
Holosun 509T footprint (HS509T / HE509T) |
| Fits |
FN 509 Tactical optics-mounting system |
| Hardware |
Mounting screws included (plate-to-slide and optic-to-plate) |
| MPN / UPC |
509PLT-FN509T / 810047071037 |
What's Included
- Holosun 509PLT-FN509T mounting plate
- Plate-to-slide and optic-to-plate mounting screws
Warranty
Covered by Holosun's manufacturer warranty, handled in the UK by Xtreme Tactical.
UK Delivery & Support
UK-stocked and dispatched tracked from our UK warehouse — no import duties or customs delays — backed by UK-based support and Holosun's warranty.
Frequently Asked Questions
Which optics does the Holosun 509PLT-FN509T plate fit?
The Holosun 509PLT-FN509T plate fits optics with the Holosun 509T footprint, which means the HS509T X2, the HE509T X2 and the HE509T-X2-GD. It does not fit RMR-footprint optics such as the 507C or 407C, and it does not fit RMSc-footprint optics such as the 507K or 407K.
Which slides does the Holosun 509PLT-FN509T plate fit?
The Holosun 509PLT-FN509T plate fits FN 509 Tactical slides using FN's own low-profile optics-mounting system. Check that your pistol carries FN's MRD mounting cut before ordering.
Are the mounting screws included with the Holosun 509PLT-FN509T?
Yes. The Holosun 509PLT-FN509T is supplied with both sets of screws — those that fix the plate to the slide, and those that fix the optic to the plate.
Is the 509T footprint the same as RMR or RMSc?
No. The Holosun 509T uses a rear-lug footprint unique to Holosun's 509 series. RMR is the larger Trijicon pattern used by the 507C and 407C, and RMSc is the smaller Shield pattern used by the 507K and 407K. Our pistol red dot footprint compatibility chart sets out which optic fits which cut.
