Description
When you trust your life to an FN MRD pistol and a Trijicon RMR, the screws holding that optic to your slide better be up to the task. The Apex Optic Mount Screw Set is built specifically for FN MRD pistols using an Apex mount designed for RMR footprint optics. This set replaces factory screws with hardened, precision-machined fasteners that eliminate shearing and loosening under heavy recoil. If you are building a defensive or competition FN handgun, this is a cheap insurance policy against optic failure at the worst possible moment.
| Manufacturer | Apex Tactical Specialties |
|---|---|
| Model | Apex Optic Mount Screw Set for FN MRD Pistols (RMR Footprint) |
| Material | Heat-treated alloy steel (per manufacturer specs) |
| Compatibility | FN MRD pistols (FN 509 MRD, FN 545 MRD, etc.) with Apex RMR footprint mount |
| Finish | Black oxide corrosion-resistant coating |
| Weight | 0.1 oz (approx. 3 grams per set) |
| Condition | New |
Key Features
- Precision heat-treated steel: These screws are hardened to resist stretching and snapping under the sharp recoil of 9mm and .45 ACP loads. Why it matters: Factory screws are often soft steel that can shear off, leaving your optic loose or completely detached.
- Correct thread pitch for FN MRD slides: Machined to match the exact thread specs of FN MRD mounting holes. Why it matters: Wrong threads strip your slide’s threads, ruining the slide and requiring expensive gunsmith repair.
- Black oxide finish: Corrosion-resistant coating that prevents rust and galling during installation. Why it matters: Galling (cold welding) can lock screws in place, making future optic swaps a nightmare.
- Includes appropriate length for RMR footprint optics: Designed specifically for Trijicon RMR, Holosun 507C/508T, and other RMR-pattern optics. Why it matters: Too-long screws can bottom out in the slide, preventing proper torque and causing zero shifts.
- Drop-in replacement for factory screws: No modification, drilling, or tapping required. Why it matters: You can swap screws in five minutes with a basic Torx driver and loctite.
Who It’s For
This screw set is for FN MRD pistol owners running a Trijicon RMR, Holosun 507C, or any RMR-footprint red dot on an Apex mount. If you carry an FN 509 MRD for duty or self-defense, or you shoot it in USPSA Carry Optics, you need fasteners that won’t fail. It also fits serious preppers who want their backup gun ready to go without loose hardware.
Pros & Cons
Pros:
– Hardened steel beats factory soft screws for reliability.
– Exact fit for FN MRD slides with Apex mount.
– Affordable upgrade compared to replacing a lost optic.
– Black oxide prevents rust in humid or sweaty conditions.
Cons:
– Only compatible with Apex mounts for RMR footprint, not factory FN mounting plates. If you are using the stock plate, this set will not work.
Comparison vs. Competitors
| Feature | Apex Tactical (This Set) | Zev Technologies RMR Screws | Agency Arms Optic Screws |
|---|---|---|---|
| Material | Heat-treated alloy steel | Stainless steel | Alloy steel (non-heat-treated) |
| Thread Compatibility | FN MRD specific | Universal (may need fitting) | Glock/1911 specific |
| Corrosion Resistance | Black oxide | Passivated stainless | Nitride |
| Price | $20 | $25–$30 | $15–$20 |
| Warranty | Limited lifetime | Limited lifetime | None |
FAQ
Will these screws fit my FN 509 MRD with the factory mounting plate?
No. This set is designed specifically for Apex Tactical’s RMR footprint mount for FN MRD pistols. If you are using the factory FN mounting plate, the thread pitch or length may not match. Check your mount brand before ordering.
Do I need to use thread locker with these screws?
Yes. Per Apex Tactical specs, apply medium-strength thread locker (Loctite 242 or Vibratite VC-3) to prevent loosening from recoil. Torque to 15–18 in-lbs using a quality torque wrench.
Are these screws compatible with Holosun 507C or 508T optics?
Yes, they fit any optic using the Trijicon RMR footprint, including Holosun 507C, 508T, 407C, and Swampfox Justice. The length is optimized for these optics on an Apex FN mount.
Can I reuse these screws if I swap optics later?
Yes, as long as you do not over-torque or strip the heads. Inspect the threads each time. Replace if you see galling or rounding.
Trust & Shipping
✓ Nationwide delivery (all 50 states)
✓ Ships 1-2 business days from our warehouse
✓ 30-day returns on unopened sets
✓ Secure checkout with SSL encryption
Browse more: FN Parts & Accessories | Optic Mounts
Last updated: April 2026
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