Compatibility
Modification required
- Model
- FN 509 Fullsize MRD
- Based on
- Manufacturer documented
Based on manufacturer documentation or support information.
Requires a THREADED BARREL in 1/2-28. Most of these pistols do not ship with one — check your barrel before buying. Compatibility (read 2026-09-21): "FN509 (Tactical) Full Size, Mid-size, and Compact with 1/2-28 threaded barrels." MRD rows are the optic cut of those sizes. Not compatible with Bar-Sto, KKM, or EFK barrels. CC EDGE, LS EDGE, 509C, 510, and 545 are not named.
Check your exact model and part before ordering. Fitment limits
Member experience
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