Description
The Apex Optic Mount is built specifically for FN MRD pistols, giving you a direct way to attach any RMR-footprint red dot to your factory slide. Designed for the FN Low Profile Optics Mounting System™, this mount works with FN USA slides that have the MRD optic cut — no extra adapters or filler plates required. It mounts straight to the slide, saving you time and eliminating the need for an MRD Key Insert.
Living and shooting in Arizona means dealing with dust, heat, and direct sun. This mount is machined from billet steel to hold zero under those conditions, even when your pistol is running hot or coated in fine dust. The low-profile design keeps the optic close to the bore axis, so your point of impact stays consistent from your first shot through a long range session. It’s suppressor-friendly too — the mount’s height clears most pistol-caliber suppressors without co-witness interference, letting you shoot with a can attached and still get a clear dot.
Key benefits for your setup:
- Direct fit for FN MRD slides — no additional plates or inserts
- Designed for RMR footprint optics (Trijicon RMR, Holosun 407/507/508, Swampfox, etc.)
- Low-profile steel construction resists warping under heat and impact
- Pre-applied High-Temperature Thread Locking patch on all screws — no liquid thread locker needed, no mess, no waiting for cure time
- Mounts securely to factory slide without modification
- Works with suppressors and high-dust environments
- Price: $70 — affordable upgrade for reliable optic mounting
Specs & fitment:
- Compatible with: FN 509 series (MRD), FN 545, FN 510, FN 502, and other FN USA slides with the Low Profile Optics Mounting System
- Optic footprint: RMR (Trijicon RMRcc, Holosun EPS carry use adapter plate — not direct fit)
- Material: Hardened steel, black nitride finish
- Screws: Pre-coated with high-temp thread locking patch (no liquid locker)
- Installation: Torque screws to manufacturer spec (typically 15 in-lbs for RMR optics)
- Weight: Approx. 0.8 oz — minimal added mass
This mount is a straight upgrade for anyone running an FN MRD pistol who wants a secure, repeatable optic mount that holds up to Arizona’s heat, dust, and suppressor use. No extra parts, no liquid thread locker,
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