Steel billet optic mount for adapting Shield RMSc or Holosun 507K footprints to FN 509 slides with the FN Low Profile Optics Mounting System™. Eliminates adapter plate slop and provides a direct-fit, zero-shift mounting surface for micro red dots on MRD-cut FN 509 pistols.
Compatibility
- FN 509 (all MRD-cut slides with FN Low Profile Optics Mounting System™)
- FN 509 Compact MRD
- FN 509 Tactical (all generations)
- FN 509 Edge
- Shield Sights RMSc footprint optics
- Holosun 507K (K-series) footprint optics
- Does not fit standard RMR footprint slides or non-MRD 509 models
Key Features
- Machined from billet steel, black oxide finish
- Direct replacement for FN factory low-profile optics plate
- Uses FN Low Profile Optics Mounting System™ interface only
- For RMSc optics: use “514” screws included with your FN 509 Tactical / MRD
- For Holosun 507K: use screws included with this mount
- Maintains factory iron sight co-witness height with standard-height sights
Install Difficulty
2 out of 5 — Standard tools: T10 Torx driver, thread locker (blue Loctite 242 recommended). Remove factory optic plate, align mount, torque screws to manufacturer spec. No slide modification required.
FAQ
Will this mount work on my FN 509 without the MRD cut?
No. This mount is designed exclusively for slides that already have the FN Low Profile Optics Mounting System™ cut. Non-MRD slides will require slide milling.
Do I need to remove the extractor or rear sight for installation?
No. The mount replaces only the factory optic plate. Extractors and rear sights remain untouched.
Can I use this mount with a Holosun EPS Carry?
Only if the EPS Carry uses the Holosun K-series (507K) footprint. The EPS Carry shares the same four-screw pattern as the 507K, so it will fit. Confirm your optic’s footprint before ordering.
Ships same business day if ordered by 2 PM EST. Lifetime warranty against manufacturing defects. Return within 30 days if uninstalled.
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