Compatibility
Fit recorded
- Model
- FN 509 Fullsize MRD
- Based on
- Manufacturer documented
Based on manufacturer documentation or support information.
Holosun page: mounts 407K/507K on FN 509 pistols with factory optic interfaces. Published only onto catalogue MRD / LOS (fn-los) hosts — not iron-only Fullsize, Midsize, or 509C.
Check your exact model and part before ordering. Fitment limits
Member experience
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